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* ''Series/TheMuppetShow'': The Electric Mayhem, the Muppets' in-house band, started with five members: Dr. Teeth, the frontman on keyboard, Janice, a GranolaGirl on lead guitar, Floyd Pepper, the TeamDad on bass, Animal, [[AllDrummersAreAnimals the wild one on drums]], and Zoot, the laid-back saxophone player. In the series' fifth season, they picked up a sixth member, this being [[TheQuietOne a mostly-silent]] trumpet player named Lips. Lips was originally just a background performer for the band, but [[Series/TheMuppets2015 later]] [[Series/TheMuppetsMayhem installments]] established him as the wise one [[HistoryWithCelebrity with a lot of inexplicable connections]].
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* ''Franchise/Star Trek'':
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* ''Franchise/Star Trek'':''Franchise/StarTrek'':
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%%* Pavel Chekov in ''Series/StarTrekTheOriginalSeries''.
%%* Seven of Nine from ''Series/StarTrekVoyager''.
%%* Worf and/or Ezri Dax from ''Series/StarTrekDeepSpaceNine'' could count as this.
%%* Seven of Nine from ''Series/StarTrekVoyager''.
%%* Worf and/or Ezri Dax from ''Series/StarTrekDeepSpaceNine'' could count as this.
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** ''Series/StarTrekTheOriginalSeries'': Pavel Chekov was introduced a a new member of the bridge crew in
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** ''Series/StarTrekVoyager'': Seven of Nine
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** ''Series/StarTrekDeepSpaceNine'': Worf
*** Ezri Dax
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* ''Series/TedLasso'': In Season 2, Jan Maas, a sardonic Dutch midfielder joins Richmond, presumably as a replacement for Roy who retired due to injury. Lampshaded in a scene where the team yell at Jamie for everything he did to them and Jan Maas shouts "I don't know you, but I don't like you!"
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* In ''Series/ParksAndRecreation'', the titular small town government office starts off with the original group of Leslie, Ron, Tom, April, Jerry, and Donna. In the Season 6 episode "Doppelgangers", after [[spoiler:Pawnee absorbs its neighboring rival town Eagleton to prevent its financial problems from dragging the whole county down]], a new character in the form of Craig joins the Pawnee Parks and Rec Department office. He eventually takes over as Department Director after the TimeSkip.
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** Straighter examples would be characters like Artemis, Cricket, or Z, who are the few other people that can actually stand the Gang for any length of time and aren't against getting involved in a scheme.
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* In the ''Franchise/TeenageMutantNinjaTurtles'' TV series ''Series/NinjaTurtlesTheNextMutation'', a fifth, [[TheChick female]] turtle named Venus was introduced to the previously all-male quartet. (She could be a sixth ranger if you count Splinter, though.)
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* In the ''Franchise/TeenageMutantNinjaTurtles'' TV series ''Series/NinjaTurtlesTheNextMutation'', a fifth, [[TheChick [[TheSmurfettePrinciple female]] turtle named Venus was introduced to the previously all-male quartet. (She could be a sixth ranger if you count Splinter, though.)
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* ''Series/DoubleTheFist'' has Tina T, TheChick who replaced Mephisto after he was taken over by an Aztec Demigod. In Series Two we got Tara, a shapeshifting cyborg assassin who was on par with Steve in combat. Comically, she was mostly used for paperwork. Blue Womp would also technically count.
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* ''Series/DoubleTheFist'' has Tina T, TheChick TheHeart who replaced Mephisto after he was taken over by an Aztec Demigod. In Series Two we got Tara, a shapeshifting cyborg assassin who was on par with Steve in combat. Comically, she was mostly used for paperwork. Blue Womp would also technically count.
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** Played with on episode 2.4, which introduces a guy named Ollie with all the traits of a sixth ranger: he joins the community service with the main gang, starts to get along with them and even has a superpower like them... but he's killed ten minutes into the episode. Ironically, Ollie's heart is transplanted to IllGirl Nikki, who eventually becomes the sixth ranger for the rest of Season 2.
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** Played with on episode 2.4, which introduces a guy named Ollie with all the traits of a sixth ranger: he joins the community service with the main gang, starts to get along with them and even has a superpower like them... but he's killed ten minutes into the episode. Ironically, Ollie's heart is transplanted to IllGirl DelicateAndSickly Nikki, who eventually becomes the sixth ranger for the rest of Season 2.
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** Chris Chibnall's scripts generally tend to take this to an [[UpToEleven extreme]] by often introducing multiple one-shot companions at a time. "Dinosaurs on a Spaceship" introduces Rory's dad Brian, the GreatWhiteHunter John Riddell and the [[HistoricalDomainCharacter Egyptian queen Nefertiti]] to make a temporary TARDIS Team, and the trend continues into Series 11, for which he acted as showrunner.
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** Chris Chibnall's scripts generally tend to take this to an [[UpToEleven [[ExaggeratedTrope extreme]] by often introducing multiple one-shot companions at a time. "Dinosaurs on a Spaceship" introduces Rory's dad Brian, the GreatWhiteHunter John Riddell and the [[HistoricalDomainCharacter Egyptian queen Nefertiti]] to make a temporary TARDIS Team, and the trend continues into Series 11, for which he acted as showrunner.
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* On ''Series/{{Glee}}'', later additions to the club have included Rachel's boyfriend Jesse from a rival glee club in the first season, new student Sam and DeadpanSnarker Lauren in the second, and Irish exchange student Rory, spoiled rich girl Sugar, Christian dreadlocked hippie Joe, and Kurt's boyfriend Blaine in the third. The fourth (after Rachel, Finn, Kurt, Mercedes, Puck, Quinn and Santana graduated) brings us Unique, [[SuspiciouslySimilarSubstitute Finn and Rachel clones]] Ryder and Marley, Puck's brother Jake, and AlphaBitch Kitty. At the midway point of the fifth season, all the original members graduated and the Glee club was disbanded, with the sixth and final season featuring an all-new Glee club lineup, with the alumni as their mentors.
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* On ''Series/{{Glee}}'', later additions to the club beyond the initial twelve have included Rachel's boyfriend Jesse from a rival glee club in the first season, new student Sam and DeadpanSnarker Lauren in the second, and Irish exchange student Rory, spoiled rich girl Sugar, Christian dreadlocked hippie Joe, and Kurt's boyfriend Blaine in the third. The fourth (after Rachel, Finn, Kurt, Mercedes, Puck, Quinn and Santana graduated) brings us Unique, [[SuspiciouslySimilarSubstitute Finn and Rachel clones]] Ryder and Marley, Puck's brother Jake, and AlphaBitch Kitty. At the midway point of the fifth season, all the remaining original members graduated and the Glee club was disbanded, with the sixth and final season featuring an all-new Glee club lineup, lineup with the alumni as their mentors.
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* On ''Series/{{Glee}}'', later additions to the club have included Rachel's boyfriend Jesse from a rival glee club in the first season, new student Sam and DeadpanSnarker Lauren in the second, and Irish exchange student Rory, spoiled rich girl Sugar, Christian dreadlocked hippie Joe, and Kurt's boyfriend Blaine in the third. The fourth (after Rachel, Finn, Kurt, Mercedes, Puck, Quinn and Santana graduated) brings us Unique, [[SuspiciouslySimilarSubstitute Finn and Rachel clones]] Ryder and Marley, Puck's brother Jake, and AlphaBitch Kitty. As of the midway point of the fifth season, all original members have graduated, [[spoiler: but the Glee club was disbanded, although it will presumably return in Season 6]]
to:
* On ''Series/{{Glee}}'', later additions to the club have included Rachel's boyfriend Jesse from a rival glee club in the first season, new student Sam and DeadpanSnarker Lauren in the second, and Irish exchange student Rory, spoiled rich girl Sugar, Christian dreadlocked hippie Joe, and Kurt's boyfriend Blaine in the third. The fourth (after Rachel, Finn, Kurt, Mercedes, Puck, Quinn and Santana graduated) brings us Unique, [[SuspiciouslySimilarSubstitute Finn and Rachel clones]] Ryder and Marley, Puck's brother Jake, and AlphaBitch Kitty. As of At the midway point of the fifth season, all the original members have graduated, [[spoiler: but graduated and the Glee club was disbanded, although it will presumably return in Season 6]]with the sixth and final season featuring an all-new Glee club lineup, with the alumni as their mentors.
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* Richard Grieco's character, Dennis Booker, on the crime drama, ''Series/TwentyOneJumpStreet''. His character was then given his own short-lived spinoff.
* Kat of ''Series/{{Alphas}}'' was introduced in the second season and spent the majority of the following episodes trying to officially join the team, which she eventually succeeded in doing.
* ''Series/{{Arrow}}'': Season 1 establishes 'Team Arrow', the PowerTrio of Oliver, Diggle and Felicity and they gain more members and allies throughout the series.
** Quentin Lance became the group's outsource and police intel starting Season 2 up until the mid-Season 3 due to a fallout. He resumes this position in Season 4.
** Sara Lance comes on board as an on-off member in Season 2 and Roy Harper later joins in the same season on a permanent basis.
** Lyla Michaels becomes a recurring ally starting the Season 2 finale.
** [[ComicBook/BlackCanary Laurel Lance]] from the Season 2 finale onwards spends her time as an outsource and legal aid. Come mid-Season 3, she tires to take her sister's place against the rest of the team's objections. Oliver eventually takes her on board.
** Thea Queen becomes an ally partway through Season 3 and officially a member during the Season Finale.
** Season 3 also introduced recurring allies such as Franchise/TheFlash and his team, ComicBook/TheAtom, and ComicBook/{{Katana}}. Malcolm Merlyn also allied with Oliver briefly, though the relationship was more antagonistic. Nyssa Al-Ghul, though helped Team Arrow in an EnemyMine scenario at the previous SeasonFinale, also officially becomes a recurring FriendlyEnemy during this season.
* ''Series/BarneyAndFriends'' started off with just Barney and Baby Bop, and then added B.J. a short while afterwards. In 2006, the series introduced a fourth dinosaur, Riff.
* Done multiple times on ''Series/BabylonFive''.
** Most of the time, it was to replace a departing character (Sheridan for Sinclair, Lochley for Ivanova), but Marcus Cole, introduced in the third season, is a straight example.
** Bester during his brief HeelFaceTurn functioned as the TokenEvilTeammate version.
* ''Series/BuffyTheVampireSlayer'':
** In season 4, Buffy herself becomes the Sixth Ranger to [[TheGovernment The Initiative]], the newly-introduced organization staffed by [[RedShirt guest-stars]].
** During season 5, the Knights of Byzantium start off as possibly ally or enemy (attack Buffy, but also beat up Glory's {{Mooks}}) before becoming full-on enemies due to their [[KnightTemplar unwillingness to show mercy]].
** Spike started off as a BigBad in Season 2, later performed a HeelFaceTurn, and did indeed end up as the protagonist's boyfriend.
** Anya starts out bad, but performs a prolonged HeelFaceTurn, and ends up part of the group.
** And finally Andrew, who spent most of season 6 fighting against Buffy, only to end up becoming one of the Scoobies the following season.
** Inverted during Season 3. Faith ''[[HeelFaceTurn starts out]]'' good and ends up good, so she is not only Inverted, but also a true Sixth Ranger, two different times. Three times if you include her short stint in the fourth season of ''Angel''. Faith serves as a sort of wild card for either show when the dynamic needs a good shaking.
** Lorne fits this trope in the ''Buffy'' spinoff ''Series/{{Angel}}''. While he debuts in season 2 as a neutral contact when the team has 4 members (Angel, Cordy, Wes, Gunn), he moves in with them and becomes far more involved with them in season 3 when they have 5 members (the previously mentioned, plus Fred) then joins the team officially in Season 4. But during season 3, while he is considered an ally, he isn't considered a core member. After Cordy departs, and Lorne makes up the fifth member, it could be said that Spike becomes the new sixth ranger.
* Jesse joins the ''Series/BurnNotice'' PowerTrio in Season Four. However, tensions are a bit high, given that he's yet to find out that he's the spy Michael (accidentally) got burned.
* ''Series/{{Charmed|1998}}'' has Leo, Cole, Chris, Billie, and Coop all acting as sixth rangers to varying degrees.
* Daniel Shaw from season 3 of NBC's ''Series/{{Chuck}}''. He occasionally joins the PowerTrio of Chuck, Sarah, and Casey on missions but only those concerning his area of expertise, the evil organization known as the Ring.
* In the second season of ''Series/{{Community}}'', Chang attempts to join the study group.
* Hawkes in ''Series/{{CSINY}}'', who joined the team as a field investigator in season 2. He was coroner before.
* Creator/DisneyChannel does this in some of their shows:
** Chad Dylan Cooper in ''Series/SonnyWithAChance'', then became Sonny's replacement in ''Series/SoRandom''.
** Marcus Little in ''[[Series/TheSuiteLifeOfZackAndCody The Suite Life on Deck]]'', although he left the series later on and Maya fills the role after he leaves.
** Gunther and Tinka Hessenheffer in ''Series/ShakeItUp'', despite the latter being billed as a recurring character.
** Carrie in the 3rd season of ''Series/AustinAndAlly'', combined with OfficialCouple to Dez.
** Season 2 of ''Series/GirlMeetsWorld'' introduces Zay Babineaux, Lucas' old friend from Texas. He combines this trope with being an AudienceSurrogate, especially as he has been present for episodes with a more serious plot. Isadora Smackle also fills this role before Zay came in the picture, but she's more of an "Extra Hero" kind of character at first.
** Zane and Rodney from ''Series/{{Bizaardvark}}'' is this in Season 3 combined with [[ThreePlusTwo Four Plus Two]]. Amelia's little sister Willow acts as this too in that season, but most of the time is only seen with her sister.
** Terry Perry in ''Series/LabRats'' was mostly an antagonist to the main characters, but becomes a full-fledged ally late Season 3 onwards, even though she still antagonizes them every now and then.
* ''Series/DoctorWho'':
** Jack Harkness fits this trope in Series 1, temporarily changing the Doctor and Rose's TheHero[=/=]{{Sidekick}} duo to a PowerTrio (once he stops trying to con them). He shows up again two seasons later, just in time to help the Doctor and Martha against the Master.
** Series 5 has Rory to Eleven and Amy. He's a bit character when he first appears, but eventually becomes a companion midway through it. [[spoiler: And then he dies and is blinked out of existence a few episodes later, only to return for the finale.]] And then by Series 6 he becomes a full-time companion for the rest of Amy's tenure.
** In Series 8, starring the duo of Twelve and Clara, Clara's {{Love Interest|s}} Danny and snarky student Courtney looked like they would become this, but it didn't happen.
** Chris Chibnall's scripts generally tend to take this to an [[UpToEleven extreme]] by often introducing multiple one-shot companions at a time. "Dinosaurs on a Spaceship" introduces Rory's dad Brian, the GreatWhiteHunter John Riddell and the [[HistoricalDomainCharacter Egyptian queen Nefertiti]] to make a temporary TARDIS Team, and the trend continues into Series 11, for which he acted as showrunner.
* ''Series/DoubleTheFist'' has Tina T, TheChick who replaced Mephisto after he was taken over by an Aztec Demigod. In Series Two we got Tara, a shapeshifting cyborg assassin who was on par with Steve in combat. Comically, she was mostly used for paperwork. Blue Womp would also technically count.
* ''Series/{{Friends}}'': Charlie Wheeler, who ''happened'' to be a TwoferTokenMinority. Also Richard and Pete, two of Monica's early boyfriends that got their own arcs. Other examples include Mike Hannigan, [[spoiler: who marries Phoebe in the end]]; Fun Bobby, Marcel the Monkey, and Gunther who appeared in the most episodes after the main six.
* Tina, Rob, Hector and Casey from ''Series/{{Ghostwriter}}''.
* On ''Series/{{Glee}}'', later additions to the club have included Rachel's boyfriend Jesse from a rival glee club in the first season, new student Sam and DeadpanSnarker Lauren in the second, and Irish exchange student Rory, spoiled rich girl Sugar, Christian dreadlocked hippie Joe, and Kurt's boyfriend Blaine in the third. The fourth (after Rachel, Finn, Kurt, Mercedes, Puck, Quinn and Santana graduated) brings us Unique, [[SuspiciouslySimilarSubstitute Finn and Rachel clones]] Ryder and Marley, Puck's brother Jake, and AlphaBitch Kitty. As of the midway point of the fifth season, all original members have graduated, [[spoiler: but the Glee club was disbanded, although it will presumably return in Season 6]]
* ''Series/{{Heroes}}'' - Sylar, by the season four finale. [[RedemptionEqualsDeath Doesn't look good for him though]]. Made worse in that he already tried it once a season before, [[StatusQuoIsGod and that didn't work out so well]]. The writers kept flip-flopping on what side they wanted him on, so he'd realize that being a good guy is more meaningful, and then realize that EvilFeelsGood, over and over. He ''happened'' to be on the good side of the HeelFaceRevolvingDoor when the show was cancelled, but that doesn't mean he's a good guy.
* Lieutenant Bush is cast this way in ''Series/HoratioHornblower'' (since the adaptation gave Horatio a different {{Lancer}} in Archie). Bush comes aboard pleased to serve under the heroic Sawyer, gets irritated at the other lieutenants' criticisms of Sawyer's erratic behavior, and observes with an unreadable expression. So when he seeks out their mutinous assembly in the middle of the night, they're quite frozen, until he expresses his own opinion of Sawyer's unfitness and that if they're planning to do something, he'd like to join them.
* Jerome from ''Series/HouseOfAnubis'' who technically joins Sibuna for protection from his "boss" [[BigBad Rufus Zeno]]. Joins up with Sibuna again in Season 2 [[spoiler:So they could rescue Trudy who had been kidnapped by Rufus]].
** Joy also counts as she was important to the mystery in the first season and was added into Sibuna by the end of season 2 [[spoiler:after helping to rescue Nina from under the Senet board]]. In season 3 she is a full member of the team, [[spoiler:but she quits after Fabian breaks her heart]].
** Eddie also joins Sibuna at the ''[[EleventhHourRanger very]]'' [[EleventhHourRanger end of season 2]] when it turns out [[spoiler:he's the Osirian]]. He didn't officially join until season 3, however.
** Willow joins for a bit in the season 3 finale, but it's cut short when [[spoiler:she becomes a Sinner]].
** TheMovie adds Mara to the team, as well as the new students Dexter, Erin and Cassie. Sophia was also a member, but [[spoiler:she was soon revealed to be the BigBad of the movie]].
* The then-love interests of anyone of the FiveManBand sans [[BetaCouple Lily and Marshall]] fill the role on ''Series/HowIMetYourMother''. [[spoiler:If the actual mother counts, she did so ''very'' [[EleventhHourRanger late in the game]], i.e. 11:58 pm.]]
* Oddly, ''Series/IronChef'' has one of these: Kobe in the original series fits the trope almost perfectly (as he even has his own customised entrance).
* In ''Series/ItsAlwaysSunnyInPhiladelphia'', Frank appears and joins as the fifth member of "The Gang", which had previously consisted only of Dennis, Dee, Charlie and Mac. Frank has become a staple of the show.
* Bob Fossil of ''Series/TheMightyBoosh'' is a sort-of Fifth Ranger to the main group of Howard, Vince, Bollo and Naboo. He was in the radio show and tv show from the beginning, but as an antagonist with not much focus. After series one ended, he vanished from the show, as the main characters no longer worked for him. He had a single cameo in series two, then in series three, he appeared in a neutral role in a few episodes, though the other characters still don't like him. In the live shows, however, he's updated to full group status, fights on the side of the heroes, and seems to be at least somewhat friendly with Vince and Howard.
* ''WebVideo/MightyMoshinEmoRangers'', a UK fan-made series (that made its way to Creator/{{MTV}}) which parodies both the Power Rangers and "emo" culture, did this in its first season with the addition of Fai, the Purple Fashioncore Ranger.
* ''Series/{{Misfits}}'':
** Played with on episode 2.4, which introduces a guy named Ollie with all the traits of a sixth ranger: he joins the community service with the main gang, starts to get along with them and even has a superpower like them... but he's killed ten minutes into the episode. Ironically, Ollie's heart is transplanted to IllGirl Nikki, who eventually becomes the sixth ranger for the rest of Season 2.
** Seth becomes the sixth ranger in Season 3.
* ''Series/TheMysticKnightsOfTirNaNog'' starts out with four heroes who have the power to command the elements of fire, air, water and earth. Around the middle of the series, they are joined by Prince Garret, who gains power over the element of forest.
* ''Series/{{NCIS}}'':
** Jimmy Palmer jumped in for Gerald after he was shot in the first season, and became a member of the main cast in season ten. Unlike the substitutions of Ziva, Vance, and Bishop, he didn't fill an existing role as a cast regular, as Gerald was never a member of the main cast. [=McGee=] or Shepard might be considered Sixth Ranger material as well, although the creation of their roles was so early in the series and so ingrained into the show's early identity as a straight procedural that they could not be said to have really altered the show's character. Palmer's increasing relevance goes hand in hand with the development of NCIS as a misfit family series as much as a procedural.
** After Ziva leaves in the tenth season, it is open if she'll be a recurring guest from time to time.
** Tobias Fornell, Hollis Mann, Mike Franks, Abigail Borin, Diane Sterling, EJ Barrett, and Jake Malloy are/were notable recurring allies of the main cast.
* ''Series/Reno911'' gave us Deputy Kimball in season 3.
* Nasir silently joins the Merry Men at the end of the pilot episode of ''Series/RobinOfSherwood'' after being set up as a minion of the bad guys. Yes, that's one episode in, but it's also a brand new Myth/RobinHood character after about 600 years.
* ''Series/MadanSenkiRyukendo'' starts off with two warriors; Ryukendo and Ryuguno. Around episode 14, a third warrior, Ryujinou appears, who first spends his time as an AntiHero, then as an AloofAlly, before finally joining the others for real.
* ''Series/{{Sherlock}}'' gives us Mary Morstan (who then becomes Mary Watson) in Series 3. Seems to be inverted/subverted in that she comes across as one of the good guys from the beginning; then it seems like she's secretly evil when we find out that [[spoiler:she was formerly an assassin]]. Ultimately double-subverted, as she turns out to be an ultimately good woman with a dark past who truly loves John.
* Major Evan Lorne from ''Series/StargateAtlantis''. He joins the Atlantis expedition in the second season, becoming a regular face on the show and a leading member of the expedition (he's the NumberTwo of Atlantis' military), and unlike other newcomers such as Ronon, Keller, Carter and Woolsey, he fills an entirely new role instead of being a replacement for a departing character.
* Vala Mal Doran in ''Series/StargateSG1''. In mid-season eight, she [[spoiler: unsuccessfully]] hijacks the Prometheus. In Season nine, she gradually moves from minor villain to anti-hero, being partially responsible for bringing the [[spoiler: Ori]] to the Milky Way among other things. In season ten, she becomes a full SG-1 member, though not after [[spoiler: losing her memory]] once.
%%* Pavel Chekov in ''Series/StarTrekTheOriginalSeries''.
%%* Seven of Nine from ''Series/StarTrekVoyager''.
%%* Worf and/or Ezri Dax from ''Series/StarTrekDeepSpaceNine'' could count as this.
* ''Series/StrangerThings'':
** In season 2, [[BigBrotherMentor Steve]] and [[GamerChick Max]] end up becoming this to the Party. The former spent the first season barely knowing them, while the latter starts out as the new kid in school. By the end, they're pretty much accepted into the fold after bonding with the Party and proving their skills. This gets lampshaded with Max, as most of the group except Lucas are initially wary of letting her in on the {{masquerade}} expressly because they feel they don't ''need'' a Sixth Ranger (that and, it's implied, Mike unconsciously seeing her as a ReplacementScrappy for [[spoiler:Eleven]]). They only change their minds when [[spoiler: Max saves Steve from Billy and helps out during the mission to distract the Mind Flayer]].
** [[TheNotLoveInterest Robin]] and [[TagalongKid Erica]] in season 3. Robin is a new girl introduced as Steve's coworker and former classmate, and Erica previously appeared as Lucas' little sister before [[AscendedExtra joining the main cast]]. Dustin and Steve recruit them out of necessity but try to keep them out of the {{Masquerade}}. [[spoiler:It doesn't stick. After the four of them discover what the Russians are really up to, the girls end up learning everything that's been going on in Hawkins for the last couple of years]].
* ''Series/{{Supernatural}}'' has seen several attempts at adding a Sixth Ranger to the Winchester brothers, with varying degrees of success. Ruby turned out to be a SixthRangerTraitor, but Castiel and Bobby seem to have well and truly worked their way into Team Free Will.
* In the ''Franchise/TeenageMutantNinjaTurtles'' TV series ''Series/NinjaTurtlesTheNextMutation'', a fifth, [[TheChick female]] turtle named Venus was introduced to the previously all-male quartet. (She could be a sixth ranger if you count Splinter, though.)
* Derek Reese in ''Series/TerminatorTheSarahConnorChronicles'', who showed up late in the first season.
* ''Series/{{Torchwood}}'':
** For the first half of Season 1 or so, this is Ianto, but by the end of the season he's just as much a part of the gang as the others. Season 2 has Martha and Season 3 has Lois.
** Rhys is the recurring Sixth Ranger from the middle of Season 2 onwards.
* Kat of ''Series/{{Alphas}}'' was introduced in the second season and spent the majority of the following episodes trying to officially join the team, which she eventually succeeded in doing.
* ''Series/{{Arrow}}'': Season 1 establishes 'Team Arrow', the PowerTrio of Oliver, Diggle and Felicity and they gain more members and allies throughout the series.
** Quentin Lance became the group's outsource and police intel starting Season 2 up until the mid-Season 3 due to a fallout. He resumes this position in Season 4.
** Sara Lance comes on board as an on-off member in Season 2 and Roy Harper later joins in the same season on a permanent basis.
** Lyla Michaels becomes a recurring ally starting the Season 2 finale.
** [[ComicBook/BlackCanary Laurel Lance]] from the Season 2 finale onwards spends her time as an outsource and legal aid. Come mid-Season 3, she tires to take her sister's place against the rest of the team's objections. Oliver eventually takes her on board.
** Thea Queen becomes an ally partway through Season 3 and officially a member during the Season Finale.
** Season 3 also introduced recurring allies such as Franchise/TheFlash and his team, ComicBook/TheAtom, and ComicBook/{{Katana}}. Malcolm Merlyn also allied with Oliver briefly, though the relationship was more antagonistic. Nyssa Al-Ghul, though helped Team Arrow in an EnemyMine scenario at the previous SeasonFinale, also officially becomes a recurring FriendlyEnemy during this season.
* ''Series/BarneyAndFriends'' started off with just Barney and Baby Bop, and then added B.J. a short while afterwards. In 2006, the series introduced a fourth dinosaur, Riff.
* Done multiple times on ''Series/BabylonFive''.
** Most of the time, it was to replace a departing character (Sheridan for Sinclair, Lochley for Ivanova), but Marcus Cole, introduced in the third season, is a straight example.
** Bester during his brief HeelFaceTurn functioned as the TokenEvilTeammate version.
* ''Series/BuffyTheVampireSlayer'':
** In season 4, Buffy herself becomes the Sixth Ranger to [[TheGovernment The Initiative]], the newly-introduced organization staffed by [[RedShirt guest-stars]].
** During season 5, the Knights of Byzantium start off as possibly ally or enemy (attack Buffy, but also beat up Glory's {{Mooks}}) before becoming full-on enemies due to their [[KnightTemplar unwillingness to show mercy]].
** Spike started off as a BigBad in Season 2, later performed a HeelFaceTurn, and did indeed end up as the protagonist's boyfriend.
** Anya starts out bad, but performs a prolonged HeelFaceTurn, and ends up part of the group.
** And finally Andrew, who spent most of season 6 fighting against Buffy, only to end up becoming one of the Scoobies the following season.
** Inverted during Season 3. Faith ''[[HeelFaceTurn starts out]]'' good and ends up good, so she is not only Inverted, but also a true Sixth Ranger, two different times. Three times if you include her short stint in the fourth season of ''Angel''. Faith serves as a sort of wild card for either show when the dynamic needs a good shaking.
** Lorne fits this trope in the ''Buffy'' spinoff ''Series/{{Angel}}''. While he debuts in season 2 as a neutral contact when the team has 4 members (Angel, Cordy, Wes, Gunn), he moves in with them and becomes far more involved with them in season 3 when they have 5 members (the previously mentioned, plus Fred) then joins the team officially in Season 4. But during season 3, while he is considered an ally, he isn't considered a core member. After Cordy departs, and Lorne makes up the fifth member, it could be said that Spike becomes the new sixth ranger.
* Jesse joins the ''Series/BurnNotice'' PowerTrio in Season Four. However, tensions are a bit high, given that he's yet to find out that he's the spy Michael (accidentally) got burned.
* ''Series/{{Charmed|1998}}'' has Leo, Cole, Chris, Billie, and Coop all acting as sixth rangers to varying degrees.
* Daniel Shaw from season 3 of NBC's ''Series/{{Chuck}}''. He occasionally joins the PowerTrio of Chuck, Sarah, and Casey on missions but only those concerning his area of expertise, the evil organization known as the Ring.
* In the second season of ''Series/{{Community}}'', Chang attempts to join the study group.
* Hawkes in ''Series/{{CSINY}}'', who joined the team as a field investigator in season 2. He was coroner before.
* Creator/DisneyChannel does this in some of their shows:
** Chad Dylan Cooper in ''Series/SonnyWithAChance'', then became Sonny's replacement in ''Series/SoRandom''.
** Marcus Little in ''[[Series/TheSuiteLifeOfZackAndCody The Suite Life on Deck]]'', although he left the series later on and Maya fills the role after he leaves.
** Gunther and Tinka Hessenheffer in ''Series/ShakeItUp'', despite the latter being billed as a recurring character.
** Carrie in the 3rd season of ''Series/AustinAndAlly'', combined with OfficialCouple to Dez.
** Season 2 of ''Series/GirlMeetsWorld'' introduces Zay Babineaux, Lucas' old friend from Texas. He combines this trope with being an AudienceSurrogate, especially as he has been present for episodes with a more serious plot. Isadora Smackle also fills this role before Zay came in the picture, but she's more of an "Extra Hero" kind of character at first.
** Zane and Rodney from ''Series/{{Bizaardvark}}'' is this in Season 3 combined with [[ThreePlusTwo Four Plus Two]]. Amelia's little sister Willow acts as this too in that season, but most of the time is only seen with her sister.
** Terry Perry in ''Series/LabRats'' was mostly an antagonist to the main characters, but becomes a full-fledged ally late Season 3 onwards, even though she still antagonizes them every now and then.
* ''Series/DoctorWho'':
** Jack Harkness fits this trope in Series 1, temporarily changing the Doctor and Rose's TheHero[=/=]{{Sidekick}} duo to a PowerTrio (once he stops trying to con them). He shows up again two seasons later, just in time to help the Doctor and Martha against the Master.
** Series 5 has Rory to Eleven and Amy. He's a bit character when he first appears, but eventually becomes a companion midway through it. [[spoiler: And then he dies and is blinked out of existence a few episodes later, only to return for the finale.]] And then by Series 6 he becomes a full-time companion for the rest of Amy's tenure.
** In Series 8, starring the duo of Twelve and Clara, Clara's {{Love Interest|s}} Danny and snarky student Courtney looked like they would become this, but it didn't happen.
** Chris Chibnall's scripts generally tend to take this to an [[UpToEleven extreme]] by often introducing multiple one-shot companions at a time. "Dinosaurs on a Spaceship" introduces Rory's dad Brian, the GreatWhiteHunter John Riddell and the [[HistoricalDomainCharacter Egyptian queen Nefertiti]] to make a temporary TARDIS Team, and the trend continues into Series 11, for which he acted as showrunner.
* ''Series/DoubleTheFist'' has Tina T, TheChick who replaced Mephisto after he was taken over by an Aztec Demigod. In Series Two we got Tara, a shapeshifting cyborg assassin who was on par with Steve in combat. Comically, she was mostly used for paperwork. Blue Womp would also technically count.
* ''Series/{{Friends}}'': Charlie Wheeler, who ''happened'' to be a TwoferTokenMinority. Also Richard and Pete, two of Monica's early boyfriends that got their own arcs. Other examples include Mike Hannigan, [[spoiler: who marries Phoebe in the end]]; Fun Bobby, Marcel the Monkey, and Gunther who appeared in the most episodes after the main six.
* Tina, Rob, Hector and Casey from ''Series/{{Ghostwriter}}''.
* On ''Series/{{Glee}}'', later additions to the club have included Rachel's boyfriend Jesse from a rival glee club in the first season, new student Sam and DeadpanSnarker Lauren in the second, and Irish exchange student Rory, spoiled rich girl Sugar, Christian dreadlocked hippie Joe, and Kurt's boyfriend Blaine in the third. The fourth (after Rachel, Finn, Kurt, Mercedes, Puck, Quinn and Santana graduated) brings us Unique, [[SuspiciouslySimilarSubstitute Finn and Rachel clones]] Ryder and Marley, Puck's brother Jake, and AlphaBitch Kitty. As of the midway point of the fifth season, all original members have graduated, [[spoiler: but the Glee club was disbanded, although it will presumably return in Season 6]]
* ''Series/{{Heroes}}'' - Sylar, by the season four finale. [[RedemptionEqualsDeath Doesn't look good for him though]]. Made worse in that he already tried it once a season before, [[StatusQuoIsGod and that didn't work out so well]]. The writers kept flip-flopping on what side they wanted him on, so he'd realize that being a good guy is more meaningful, and then realize that EvilFeelsGood, over and over. He ''happened'' to be on the good side of the HeelFaceRevolvingDoor when the show was cancelled, but that doesn't mean he's a good guy.
* Lieutenant Bush is cast this way in ''Series/HoratioHornblower'' (since the adaptation gave Horatio a different {{Lancer}} in Archie). Bush comes aboard pleased to serve under the heroic Sawyer, gets irritated at the other lieutenants' criticisms of Sawyer's erratic behavior, and observes with an unreadable expression. So when he seeks out their mutinous assembly in the middle of the night, they're quite frozen, until he expresses his own opinion of Sawyer's unfitness and that if they're planning to do something, he'd like to join them.
* Jerome from ''Series/HouseOfAnubis'' who technically joins Sibuna for protection from his "boss" [[BigBad Rufus Zeno]]. Joins up with Sibuna again in Season 2 [[spoiler:So they could rescue Trudy who had been kidnapped by Rufus]].
** Joy also counts as she was important to the mystery in the first season and was added into Sibuna by the end of season 2 [[spoiler:after helping to rescue Nina from under the Senet board]]. In season 3 she is a full member of the team, [[spoiler:but she quits after Fabian breaks her heart]].
** Eddie also joins Sibuna at the ''[[EleventhHourRanger very]]'' [[EleventhHourRanger end of season 2]] when it turns out [[spoiler:he's the Osirian]]. He didn't officially join until season 3, however.
** Willow joins for a bit in the season 3 finale, but it's cut short when [[spoiler:she becomes a Sinner]].
** TheMovie adds Mara to the team, as well as the new students Dexter, Erin and Cassie. Sophia was also a member, but [[spoiler:she was soon revealed to be the BigBad of the movie]].
* The then-love interests of anyone of the FiveManBand sans [[BetaCouple Lily and Marshall]] fill the role on ''Series/HowIMetYourMother''. [[spoiler:If the actual mother counts, she did so ''very'' [[EleventhHourRanger late in the game]], i.e. 11:58 pm.]]
* Oddly, ''Series/IronChef'' has one of these: Kobe in the original series fits the trope almost perfectly (as he even has his own customised entrance).
* In ''Series/ItsAlwaysSunnyInPhiladelphia'', Frank appears and joins as the fifth member of "The Gang", which had previously consisted only of Dennis, Dee, Charlie and Mac. Frank has become a staple of the show.
* Bob Fossil of ''Series/TheMightyBoosh'' is a sort-of Fifth Ranger to the main group of Howard, Vince, Bollo and Naboo. He was in the radio show and tv show from the beginning, but as an antagonist with not much focus. After series one ended, he vanished from the show, as the main characters no longer worked for him. He had a single cameo in series two, then in series three, he appeared in a neutral role in a few episodes, though the other characters still don't like him. In the live shows, however, he's updated to full group status, fights on the side of the heroes, and seems to be at least somewhat friendly with Vince and Howard.
* ''WebVideo/MightyMoshinEmoRangers'', a UK fan-made series (that made its way to Creator/{{MTV}}) which parodies both the Power Rangers and "emo" culture, did this in its first season with the addition of Fai, the Purple Fashioncore Ranger.
* ''Series/{{Misfits}}'':
** Played with on episode 2.4, which introduces a guy named Ollie with all the traits of a sixth ranger: he joins the community service with the main gang, starts to get along with them and even has a superpower like them... but he's killed ten minutes into the episode. Ironically, Ollie's heart is transplanted to IllGirl Nikki, who eventually becomes the sixth ranger for the rest of Season 2.
** Seth becomes the sixth ranger in Season 3.
* ''Series/TheMysticKnightsOfTirNaNog'' starts out with four heroes who have the power to command the elements of fire, air, water and earth. Around the middle of the series, they are joined by Prince Garret, who gains power over the element of forest.
* ''Series/{{NCIS}}'':
** Jimmy Palmer jumped in for Gerald after he was shot in the first season, and became a member of the main cast in season ten. Unlike the substitutions of Ziva, Vance, and Bishop, he didn't fill an existing role as a cast regular, as Gerald was never a member of the main cast. [=McGee=] or Shepard might be considered Sixth Ranger material as well, although the creation of their roles was so early in the series and so ingrained into the show's early identity as a straight procedural that they could not be said to have really altered the show's character. Palmer's increasing relevance goes hand in hand with the development of NCIS as a misfit family series as much as a procedural.
** After Ziva leaves in the tenth season, it is open if she'll be a recurring guest from time to time.
** Tobias Fornell, Hollis Mann, Mike Franks, Abigail Borin, Diane Sterling, EJ Barrett, and Jake Malloy are/were notable recurring allies of the main cast.
* ''Series/Reno911'' gave us Deputy Kimball in season 3.
* Nasir silently joins the Merry Men at the end of the pilot episode of ''Series/RobinOfSherwood'' after being set up as a minion of the bad guys. Yes, that's one episode in, but it's also a brand new Myth/RobinHood character after about 600 years.
* ''Series/MadanSenkiRyukendo'' starts off with two warriors; Ryukendo and Ryuguno. Around episode 14, a third warrior, Ryujinou appears, who first spends his time as an AntiHero, then as an AloofAlly, before finally joining the others for real.
* ''Series/{{Sherlock}}'' gives us Mary Morstan (who then becomes Mary Watson) in Series 3. Seems to be inverted/subverted in that she comes across as one of the good guys from the beginning; then it seems like she's secretly evil when we find out that [[spoiler:she was formerly an assassin]]. Ultimately double-subverted, as she turns out to be an ultimately good woman with a dark past who truly loves John.
* Major Evan Lorne from ''Series/StargateAtlantis''. He joins the Atlantis expedition in the second season, becoming a regular face on the show and a leading member of the expedition (he's the NumberTwo of Atlantis' military), and unlike other newcomers such as Ronon, Keller, Carter and Woolsey, he fills an entirely new role instead of being a replacement for a departing character.
* Vala Mal Doran in ''Series/StargateSG1''. In mid-season eight, she [[spoiler: unsuccessfully]] hijacks the Prometheus. In Season nine, she gradually moves from minor villain to anti-hero, being partially responsible for bringing the [[spoiler: Ori]] to the Milky Way among other things. In season ten, she becomes a full SG-1 member, though not after [[spoiler: losing her memory]] once.
%%* Pavel Chekov in ''Series/StarTrekTheOriginalSeries''.
%%* Seven of Nine from ''Series/StarTrekVoyager''.
%%* Worf and/or Ezri Dax from ''Series/StarTrekDeepSpaceNine'' could count as this.
* ''Series/StrangerThings'':
** In season 2, [[BigBrotherMentor Steve]] and [[GamerChick Max]] end up becoming this to the Party. The former spent the first season barely knowing them, while the latter starts out as the new kid in school. By the end, they're pretty much accepted into the fold after bonding with the Party and proving their skills. This gets lampshaded with Max, as most of the group except Lucas are initially wary of letting her in on the {{masquerade}} expressly because they feel they don't ''need'' a Sixth Ranger (that and, it's implied, Mike unconsciously seeing her as a ReplacementScrappy for [[spoiler:Eleven]]). They only change their minds when [[spoiler: Max saves Steve from Billy and helps out during the mission to distract the Mind Flayer]].
** [[TheNotLoveInterest Robin]] and [[TagalongKid Erica]] in season 3. Robin is a new girl introduced as Steve's coworker and former classmate, and Erica previously appeared as Lucas' little sister before [[AscendedExtra joining the main cast]]. Dustin and Steve recruit them out of necessity but try to keep them out of the {{Masquerade}}. [[spoiler:It doesn't stick. After the four of them discover what the Russians are really up to, the girls end up learning everything that's been going on in Hawkins for the last couple of years]].
* ''Series/{{Supernatural}}'' has seen several attempts at adding a Sixth Ranger to the Winchester brothers, with varying degrees of success. Ruby turned out to be a SixthRangerTraitor, but Castiel and Bobby seem to have well and truly worked their way into Team Free Will.
* In the ''Franchise/TeenageMutantNinjaTurtles'' TV series ''Series/NinjaTurtlesTheNextMutation'', a fifth, [[TheChick female]] turtle named Venus was introduced to the previously all-male quartet. (She could be a sixth ranger if you count Splinter, though.)
* Derek Reese in ''Series/TerminatorTheSarahConnorChronicles'', who showed up late in the first season.
* ''Series/{{Torchwood}}'':
** For the first half of Season 1 or so, this is Ianto, but by the end of the season he's just as much a part of the gang as the others. Season 2 has Martha and Season 3 has Lois.
** Rhys is the recurring Sixth Ranger from the middle of Season 2 onwards.
