History Series / NineOneOne

* {{Hypocrite}}: Josh reprimands Eddie when Eddie hijacks Linda's call in "Outside Looking In." Josh's harsh tone comes from Eddie not being an actual dispatcher, which is understandable. However, he picked Claudette's side when May came at Josh talking about Claudette hijacking her call in "Peer Pressure."

** Buck has ''Buck Begins'', showing his childhood under his neglectful parents.

* TheTeam: Bobby is the captain, Chimney and Hen are the paramedics, and Buck, Eddie, Ravi, and Lucy are the firefighters.

* LateComingOut: After decades of marriage and kids, Michael comes out to his wife and children.

** The mosquito outbreak Taylor reports on in "Dosed" is referenced as a potential contributing factor of the BatSwarm incident in the next episode, "Haunted".

A spinoff, titled ''Series/NineOneOneLoneStar'', debuted January 19, 2020. In 2023, the series was renewed for a 7th season, which {{ChannelHop}}ped to [[Creator/AmericanBroadcastingCompany ABC]], with ''Lone Star'' remaining on Fox, making ''9-1-1'' the first TV franchise to have different entries airing simultaneously on different broadcast networks since the ''Franchise/{{Buffyverse}}'' (where ''Series/{{Angel}}'' was airing on Creator/TheWB while ''Series/BuffyTheVampireSlayer'' was airing on Creator/{{UPN}}), also a [[Creator/TwentiethCenturyStudios 20th Television]] property.

A spinoff, titled ''Series/NineOneOneLoneStar'', debuted January 19, 2020. In 2023, the series was renewed for a 7th season, which will ChannelHop to Creator/{{ABC}}, with ''Lone Star'' remaining on Fox, making ''9-1-1'' the first TV franchise to have different entries airing simultaneously on different broadcast networks since the ''Franchise/{{Buffyverse}}'' (where ''Series/{{Angel}}'' was airing on Creator/TheWB while ''Series/BuffyTheVampireSlayer'' was airing on Creator/{{UPN}}), also a [[Creator/TwentiethCenturyStudios 20th Television]] property.

** Bobby and his notebook in Season 1. [[spoiler: After an on-the-job injury, he became addicted to painkillers and alcohol. One night, his space heater malfunctioned and started a fire that consumed the apartment building. It ended up killing over a hundred people, including his wife and young children. Bobby keeps track of the lives he saves on the job, trying to balance the two numbers...so he can finally kill himself.]].

** The ObnoxiousEntitledHousewife from "9-1-1, What's Your Grievance?" who was shot while making a 911 call had previously poisoned one of her neighbors' pets, and was overall so unpleasant that nobody shed any tears over her death. Athena even struggled with calling her a victim.

* RememberTheNewGuy: Buck’s sister Maddie is introduced in "Under Pressure", with no previous mentions of her at all in Season 1. However, this is justified by their three-year estrangement and Buck’s general lack of discussion about his past.

** In "Jinx", the firehouse never uses the words "pretty quiet" or any variation because they believe it jinx them and they have to deal with crazy calls.

** Athena's daughter almost kills herself because she was being viciously bullied at school. An angry Athena busts the bully at a house party she was throwing and tells her what happened. Does the bully show any remorse for what she did? Nope. Instead, she says that she's glad it happened and starts throwing insults about the girl. That's right. This girl flat out says that she's ''glad'' a girl she bullied almost died ''to the girl's mother, who also happens to be a cop!'' And then she's shocked when Athena arrests her.

Taking place in UsefulNotes/LosAngeles, the series tackles the lives of the city's first responders through the leading lens of LAPD Sergeant Athena Grant (Creator/AngelaBassett), LAFD Captain Bobby Nash (Creator/PeterKrause), and 911 operator Abby Clark (Creator/ConnieBritton). Athena and her estranged husband, Michael (Creator/RockmondDunbar), jointly raise their kids May (Creator/CorinneMassiah) and Harry (Marcanthonee Jon Reis). Also in focus are LAFD firefighters Evan "Buck" Buckley (Creator/OliverStark), Hen Wilson (Creator/AishaHinds), and Howard "Chimney" Han (Creator/KennethChoi), joined in the second season by Eddie Díaz (Ryan Guzman), who is raising a son, Christopher (Gavin [=McHugh=]). After Abby decides to resign and leave Los Angeles at the end of the first season, her role as 911 operator is replaced by Maddie (Creator/JenniferLoveHewitt), Buck's sister.

** In one episode, May, having moved into her own apartment, returns to the family house to pick up her mail only to find Athena and Bobby about to begin roleplay sex, which includes Athena in Bobby's firemen jacket and Bobby in only a chef's apron.

* ItsAllAboutMe

* TrappedInATanningBed: An AssholeVictim who ran a gym died when he used his own tanning bed (which he kept insisting wasn't broken and refused to fix) and couldn't open it when he was done. It was DeathByIrony because the day before, he left his dog in the car with the windows rolled up.

* FiveManBand: The firehouse crew.
** TheHero: Bobby
** TheLancer / TheSmartGuy: Chimney pulls double duty as Bobby's second-in-command and the most skilled paramedic.
** TheBigGuy: Buck and Eddie
** TheHeart: Hen
** SixthRanger: Abby in season 1, Maddie in season 2.

** It's revealed in Season 4 that Buck [[spoiler:was conceived as a savior baby in order to produce a stem cell donor to cure their firstborn son Daniel's leukemia. When Daniel died of his illness anyway, they were cold and neglectful towards him to the point where he would deliberately injure himself because it was the only way he could get their attention. They also asked Maddie, who was still a child herself, to keep this a secret from Buck and refused to allow her to talk about Daniel, which caused her a significant amount of distress, on top off leaving her badly parentified at the age of nine. Their grief over their son's death, while very real and understandable, is not an excuse for the way they treated their surviving children.]]

A spinoff, titled ''Series/NineOneOneLoneStar'', debuted January 19, 2020. In 2023, the series was renewed for a 7th season, which will ChannelHop to Creator/{{ABC}}.

** Psychotic killer Jeffrey Hudson [[spoiler:steals a cop's badge and caught on video claiming to be one. Athena chases him to a "police-free zone" of the city where she talks of how "an animal with a badge" is on the loose." It takes little time for the residents to identify this "cop" for Athena to chase into a trap]].

* NoGoodDeedGoesUnpunished: While she agrees and understands Athena's feelings that led her to arrest her daughter's bully, her captain makes it clear she can't condone an officer using her badge for a personal vendetta and has to suspend Athena and put her on desk duty.

A spinoff, titled ''Series/NineOneOneLoneStar'', debuted January 19, 2020.

%% * GettingCrapPastThe Radar: Due to overwhelming and persistent misuse, this example was removed. Please check the trope page to make sure your example fits the current definition.

* InspirationallyDisadvantaged: Eddie's son Christopher has Cerebral Palsy and walks with crutches. That being said, he is mostly seen as a happy kid that the team takes to immediately. Buck even tells him that his positivity despite his condition is one of the things he loves and admires the most about Chris.

** Eddie's parents despise Shannon for leaving Eddie and Christopher while belittling Eddie's parenting choices (Eddie's mother even says Eddie is dragging Christopher down with him), despite [[{{Hypocrite}} Eddie's father himself being generally absent in his children's lives, even missing all three of his children's deliveries]]. [[spoiler:They also try to guilt-trip Eddie into giving them Christopher under the assumption that it's "better for him," ignoring that it was at the cost of ''taking Chris from his actual parent.'' This prompts Eddie to move with Christopher to L.A.]].

* ActorAllusion: In 5x05, when Hen tella Eddie to keep up with her by saying "Don't step on your toes," Eddie quickly remarks that he's "an excellent dancer." This refers to Ryan Guzman's role in [[Film/StepUp Step Up: Revolution and Step Up: All In]].

** Bobby and his notebook. [[spoiler: After an on-the-job injury, he became addicted to painkillers and alcohol. One night, his space heater malfunctioned and started a fire that consumed the apartment building. It ended up killing over a hundred people, including his wife and young children. Bobby keeps track of the lives he saves on the job, trying to balance the two numbers...so he can finally kill himself]].

* EasilyForgiven: Except for Bobby and Eddie, the rest of the 118 have forgiven Buck by the time of the next episode after [[spoiler:he sued the city for wrongful termination after Bobby didn't reinstate Buck due to blood thinner medication being a liability and Buck's lawyer took information from the 118's personal lives to be used against them]].

** "Survivors". In the last few minutes of the episode, the team has successfully rescued a child from his abusive mother and everything seems to have been neatly wrapped up [[spoiler:when Eddie suddenly is shot by a sniper]].