There was a blue light special on masks.
- Agents of S.H.I.E.L.D.:
- In the episode "A Hen in the Wolf House", Cal teams up with HYDRA head Daniel Whitehall, noting that the two of them have a mutual enemy in Coulson. Their alliance lasts a few episodes, but ultimately Cal may have his issues with Coulson, but he utterly hates Daniel Whitehall — the man who tortured Cal's wife to death and is ultimately responsible for Cal losing his daughter, Daisy - and is simply using Whitehall and HYDRA to get to his daughter, then plans to murder Whitehall the first chance he gets..
- Partway through Season 4, Doctor Radcliffe and his robot assistant AIDA go rogue from SHIELD and team up with the Watchdogs, led by Anton Ivanov/The Superior — the Watchdogs get inside information to use against SHIELD and the Inhumans, while Radcliffe and AIDA get the resources needed to perfect the Framework. During the final arc of the season, AIDA betrays Radcliffe and turns Ivanov into a Brain in a Jar controlling a series of robot bodies in order to aid her own plans for the Framework.
- Angel: Wolfram and Hart were prone to this. In the first season, they enlisted Faith. In the second, they brought back Darla and then had Drusilla vamp her (it went badly for them). They also attempted to ally with or control Holtz and the Beast, unsuccessfully.
- Buffy the Vampire Slayer:
- In "The Yoko Factor", Adam recruits Spike to help tear the Scooby Gang apart.
- Spike promises Xander and Giles a team-up with Faith after she awakes from her coma, but it doesn't pan out.
- There's one between Faith and Mayor Wilkins that lasts for about half of S3.
- On a larger scale, one of Adam's goals in S4 is to unite vampires and demons.
- Burn Notice: In the episode "Dead" Larry Sizemore and Tyler Brennen, two of Michael Westen's worst enemies, team up. Their partnership lasted just half the episode, since Larry never intended to work with Brennen long-term and simply stabs him in the chest, killing him.
- El Chapulín Colorado: Tripaseca, Cuajináis, Chory and La Minina all team-up in episode ¡No seas torpe, Chapulín! trying to trick the heroe into using his chiquitolina pills and crush him. Thankfully The Good Guys Always Win.
- Defiance: Near the end of the first season, Datak allies with the corrupt Earth Republic (represented by Colonel Marsh) in order to discredit Nolan and Amanda and help Datak win the mayoral election. In exchange, the plan is that Datak will help the E-Rep gain control of Rafe's mines (with Datak getting a sizable chunk of the profits). Then, in the season finale, it turns out Marsh was just using Datak to take over the town and get to the ancient Votan ship buried underneath it. When Datak realizes this, he kills Marsh in a rage.
- Doctor Who:
- The last few scenes of "Frontier in Space" reveal that the Master has, for the whole story, been acting as a Psycho for Hire for the Daleks.
- Part of the plot of "The Mark of the Rani", wherein the Master and the Rani team up against the Sixth Doctor, though it's not really a mutual agreement. The Master blackmails and bribes the Rani into cooperating with him, and when he eventually botches the entire plan due to his obsession with the Doctor, the Rani registers her displeasure.
- A comic strip from the 1990s parodies this, with an omnipotent superbeing uniting all the Doctor's enemies together as one super-army, and then siccing them on all (then) eight Doctors. The Doctors point out the obvious flaw in the logic of bad guys all of whom they'd already defeated uniting to try and defeat them again... and then go on to defeat them all again.
- "Doomsday" subverts this; the Cybermen offer the Daleks an alliance. The Daleks instinctively refuse. The rest of the episode involves the Daleks and the Cybermen kicking the snot out of each other, with the Doctor and the humans trapped in the middle.
- "The Pandorica Opens": Almost all of the Doctor's enemies we've ever heard of, and more, descend on Earth in 102 A.D. to witness the title event. Turns out that, while the Doctor knew the Pandorica was a prison of some sort he had assumed it was already occupied by someone. Really, what happened was that all of his foes came together to trap the Doctor in the Pandorica in order to prevent the destruction of the universe at (what they think is) his hands.
- The end of "Dark Water" reveals that Missy has been working with the Cybermen all along, and that she herself is the Master... erm, Mistress.
- The most recent version of the Master teamed up with Ashad, the Lone Cyberman in "Ascension of the Cybermen". Until it's more convenient for the Master to kill Ashad, take the Cyberiad, and put it to use himself.
- The Magic: The Gathering preconstructed deck from the Universes Beyond crossover, "Masters of Evil," features a chaotic mishmash of antagonists for the player to field, with just the viable leader options featuring the Valeyard, Missy, Davros, the Cult of Skaro, the Rani and the Lone Cyberman. Other cards bring in a wild selection of bad guys from across the show, from various iterations of the Master to Zygons to Sontarans to Weeping Angels to one-episode wonders like the Emojibots, all kept pointing the same way through Gameplay and Story Segregation.
- As expected, this happens in The Flash (2014). First, there are the Rogues (Leonard "Captain Cold" Snart, Mick "Heat Wave" Rory, and Lisa "Golden Glider" Snart). Then there are the two Tricksters. And later we have Mark "Weather Wizard" Mardon breaking the older Trickster and Cold out of jail in an attempt to team up against the Flash. Cold ends up walking away and even warning Barry, as Barry has saved his sister a few episodes earlier (plus, it's Christmas). The Trickster and Mardon, however, do nearly succeed in killing Barry (the Trickster gives out a hundred remote-controlled bombs as gifts to little kids, and Mardon forces Barry to stand there and let himself be killed in exchange for not blowing up the bombs). There are also the Reverse-Flash and Gorilla Grodd, although, in a weird way, it's more of a father-son relationship.
- Gotham does this frequently. Examples include Penguin and the Riddler; the Riddler, Tabitha Galavan, and Barbara Kean; Penguin and Ivy; and Jerome, Scarecrow, and Mad Hatter. These alliances usually eventually fall apart, although a few of the villains seem to have allies that they respect and/or are less willing to betray. Jerome, a captain ersatz for the Joker, at one point actually calls his alliance with the Scarecrow, the Mad Hatter and a few other villains a "Legion of Horribles", and then makes them all sit through a mandatory brunch meeting together while discussing their evil plans.
- Heroes: Season Three is about every villain still alive being united to serve Arthur Petrelli.
- The Highlander two-parter, "Unholy Alliance", in which James Horton and Xavier St. Cloud team up.
- Odd Squad:
- "Disorder in the Court" has Odd Todd and the Shapeshifter team up in order to frame Olive for the crime of stealing the town museum that they committed. However, the Shapeshifter doesn't reveal herself until after the verdict is given and Olive is proclaimed innocent, and doesn't do much to help other than keep the museum in the villains' hands.
- In "Flawed Squad", the Shapeshifter, Fladam, Jamie Jam, the Noisemaker, Evil Mime, and Father Time all team up to stop Odd Squad by going after Precinct 13579's agents. While they are successful for a time, their lack of expertise in teamwork and working together leads to things going south.
- In "Who Let the Doug Out?", Delivery Doug gives a speech to Lady Bread and Fladam about the egg salad sandwiches he makes and sells, which they interpret to mean that they should team up to cause oddness instead of arguing with each other. Doug tries to clarify that he was talking about his sandwiches, but to no avail, as they don't listen to him and stride out of Ms. O's office to go out into the world and wreak havoc. Olympia, Otis, and Ms. O are quick to give him "what the hell were you thinking" reactions.
- The Ecoloco from Odisea Burbujas teams up with Peter Punk and Socapa, respectively, in different episodes.
- Power Rangers:
- Power Rangers in Space: There was the United Alliance of Evil, a group formed by Dark Spectre and comprised of the villains from the first five seasons, namely Lord Zedd, Rita Repulsa, the Machine Empire and Divatox.
- Power Rangers Lost Galaxy: Trakeena teams up with the Psycho Rangers to defeat the Galaxy Rangers. This necessitates the Galaxy Rangers team up with the Space Rangers.
- In Power Rangers: Dino Thunder, when Lothor returned, he briefly teamed up with Mesogog. After the Rangers foiled their plan, Mesogog ended the alliance and the two villains fought each other. Mesogog won.
- In Power Rangers S.P.D., when Emperor Grumm went back in time, he teamed up with Zeltrax.
- With four villain factions in Power Rangers Operation Overdrive, it was unavoidable there'd be some occasional team ups but the most memorable was when Thrax, the son of Rita Repulsa and Lord Zedd, temporarily united all of them against the Power Rangers. The villains made it quite clear they'd only be united against the Rangers and, after the heroes were permanently dealt with, the factions would war among themselves again. Well, it was said at the top of the page the villains usually only team up to destroy the heroes. That alliance ended when Thrax was destroyed.
- This happens pretty much anytime there is a Power Rangers team-up.
- Revolution: Monroe and Randall Flynn ally in the second half of the season, starting at the end of episode 11.
- Smallville: There have been a few villain team-ups. Firstly, in season 3, three of the meteor freaks Clark Kent had taken down teamed up to steal his powers and escape. There have also been team-ups between Brainiac and Bizarro, Lex and Toyman, and recently several Superman villains from the comics were teamed up by LuthorCorp to become Smallville's version of the Injustice Gang.
- Star Trek
- Star Trek: The Next Generation: recurring villain and Data's Evil Twin Lore team-up with a group of Borg in the two-part episode "Descent".
- Star Trek: Deep Space Nine: The Cardassians and the Dominion form an alliance in the last few seasons, which eventually expands to include the Breen.
- Star Trek: Voyager has Cardassian infiltrator Seska joining the Kazons.
- Star Trek: Picard has a Renegade Splinter Faction of Changelings team up with the Borg.
- Supernatural:
- Crowley manages to temporarily team up with Raphael in the sixth season finale after his previous deal with Castiel fell apart, but that lasted all of ten minutes before Cas Out-Gambitted them both, killed Raph, and sent Crowley on the run.
- Both Crowley and the Alpha Vampire attempt to pull one with Dick Roman in the following season (Crowley even bakes gluten-free baby uvula muffins for the occasion!), but both get shot down.
- Seasons before any of them, "Fresh Blood" had a team-up between the show's at-the-time-only-two recurring human villains, Bela Talbot and Gordon Walker.
- Super Sentai: Vs. Movies often have villains of both shows coming together to fight both teams. The older ones are usually leftovers of the now-defunct organizations trying to have one last go at their foes.
- Gekisou Sentai Carranger vs. Ohranger: Bara Mobile who is a survivor of the Baranoia Empire, the villains of Chouriki Sentai Ohranger, teams up with the Bowzock, the baddies of Gekisou Sentai Carranger in order to defeat both Ohrangers and Carrangers.
- Seijuu Sentai Gingaman vs. Megaranger features Hizumina, successor to the deceased Shibolena and daughter/creation of Dr. Hinelar who was the main antagonist of Denji Sentai Megaranger, teaming up with Captain Gregory, best friend of Captain Zahab the main antagonist of Seijuu Sentai Gingaman, in order to avenge Dr. Hinelar and resurrect the Balban to conquer the Universe. Notably, both main antagonists are newly made for the movie and appear after both villainous factions have been defeated.
- Mirai Sentai Timeranger vs. GoGoFive features Pierre, butler of the Psyma Clan from Kyu Kyu Sentai Go Go V and the only survivor, teaming up with the Londerz Family to help them destroy both Timeranger and GoGoV; he also fuses with the Monster of the Week Killer Boxer Boribaru into Boripierre.
- Ninpuu Sentai Hurricaneger vs. Gaoranger: Tsuetsue and Yabaiba, the last remaining evil Orgs from Hyakujuu Sentai Gaoranger, team up with the Space Ninja Jakanja member Chubozu (brother of Chuuzubo), the antagonists of Ninpuu Sentai Hurricaneger, to take revenge on the Gaorangers and help the Jakanja exterminate the Hurricanegers by helping them steal the Gaorangers' powers.
- Bakuryuu Sentai Abaranger vs. Hurricaneger features the Dino Guts-empowered Jakanja ninja Iga as well as Wendinu and Furabijo teaming up with the Evolian in order to defeat both Abaranger and Hurricaneger and join the Evolian's conquests.
- Tokusou Sentai Dekaranger vs. Abaranger has an Alienizer, Gijinfuan Kazakh, team up with the last remaining evil Trinoid, Sauneel Gingko, in a plot to resurrect the Big Bad of Bakuryuu Sentai Abaranger, Wicked Life God Dezumozorya, so Kazakh can ally with it to conquer Earth and the Universe.
- Mahou Sentai Magiranger vs. Dekaranger features another interesting example in Agent X, a member of Infershia looking to follow in the footsteps of Tokusou Sentai Dekaranger's central antagonist Abrella by conquering the Universe to make it a crime-laden paradise.
- Engine Sentai Go-onger vs. Gekiranger: Meka, the last surviving member of Rinjuken Akugata, teams up with the Gaiark. Followed by Long hijacking the plot after Meka and the Gaiark unseal him.
- Samurai Sentai Shinkenger Vs Go Onger Ginmaku Bang has the Gaiark teaming up with the Gedoshu to enact their goals.
- Tensou Sentai Goseiger Vs Shinkenger Epic On Ginmaku features Buredoran taking on the deceased Doukoku Chimatsuri's title and power so he can manipulate the Gedoushu into giving him the Sanzu River's water to destroy the Gosei World with help from a brainwashed Takeru Shiba then destroy both Goseigers and Shinkengers, though Shitari turns on him after his real motives are exposed, Madakodama, a newly-made monster from the Gedoushu, joins his plan anyway.
- TV Colosso: There was a sketch named "As Aventuras do Super Cão" (The Adventures of Super Dog. Not that superdog). In one episode, the villains teamed up and the eponymous hero wasn't worried. The villains argued about who had the idea one of them was presenting.
