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* ''Series/{{Angel}}'''s finale, with Angel asking the hated and usually villainous Lindsey to help his team against the BigBad, although he then, through Lorne, betrayed Lindsey. Illyria was also a semi-unlikely ally.
* ''Series/BabylonFive'': The cast spent a good amount of time gathering all of the younger races, and several of the older ones, for their battle with the Shadows [[spoiler:and Vorlons.]]
** From the backstory, there's the Dilgar War. At the start of the war the Abbai called for help from anyone willing to fight, but the few who answered the call (League races that hadn't been attacked yet and a few Narn related to the ones slaughtered by Jha'dur) didn't have the strength to stop them. Then the Earth Alliance answer the call, [[AwakeningTheSleepingGiant stopping the Dilgar out cold with a growing strength that already matched theirs]].
** Again from the backstory, the Earth-Minbari War. According to the ExpandedUniverse Earth Alliance decided it was time to cash the life debts owed by the League, and called for their help. It was [[SubvertedTrope subverted]]; most of the League races sent condolences, the Brakiri were organizing a fleet but changed their mind when [[GunboatDiplomacy a Minbari warcruiser jumped in bombing range of their homeworld and powered up the weapons before jumping out]], and the Drazi switched their support from combatants to heavy weapon technology plans after the first wave of their reinforcement fleets disappeared in hyperspace. This perceived betrayal is half of the reason of the human attitude in the series (the other being the fact nobody knows why the Minbari surrendered as they prepared to destroy Earth).
* Part one of the series finale of ''Series/{{Battlestar Galactica|2003}}'' ends with Adama putting out one of these for [[spoiler: the mission to rescue Hera from Cavil's Cylons. Every character we know from the fleet is called upon to help with the mission if they so choose, including those Marines that were imprisoned after supporting the mutiny against Adama earlier in the season.]]
%%* ''Series/BuffyTheVampireSlayer'':
%%** "Graduation" episode.
%%** "Chosen", but on a more epic scale.
* ''Series/DoctorWho'':
** [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth"]]: Harriet Jones, the former Prime Minister ([[RunningGag yes, we know who she is]]), finds she needs to call on the Doctor despite the fact he's the one who deposed her. She even sacrifices her own life to serve as a distraction for the Daleks so the call for aid can get through. However, unlike other examples, it is more obvious the Doctor's companions will help.
** [[Recap/DoctorWhoS32E7AGoodManGoesToWar "A Good Man Goes to War"]]: The Doctor does this again when he needs to [[spoiler:rescue Amy and her daughter]], by gathering people who owe him debts. Some of them we've seen before, such as [[spoiler:the pirates from [[Recap/DcotorWhoS32E3TheCurseOfTheBlackSpot "The Curse of the Black Spot"]], the space-Spitfires from [[Recap/DoctorWhoS31E3VictoryOfTheDaleks "Victory of the Daleks"]] and Dorium the black marketeer from [[Recap/DoctorWhoS31E12ThePandoricaOpens "The Pandorica Opens"]].]] Others are introduced in the same episode.
** In [[Recap/DoctorWhoS32E13TheWeddingOfRiverSong "The Wedding of River Song"]], there's an especially touching one when [[spoiler:River explains they've constructed a distress beacon to broadcast "The Doctor is dying. Please, please help." and the Doctor comments "That would mean nothing to anyone." To which River replies:]]
--->'''River''' The sky is full of a million million voices, saying, "Yes of course. We'll help." You've touched so many lives, saved so many people. Did you think when your time came you'd really have to do more than just ask?
** In [[Recap/DoctorWho50thASTheDayOfTheDoctor "The Day of the Doctor"]], the Time Lords are losing the final battle of the Great Time War, when three versions of the Doctor show up to save the planet, using their TARDIS's to put the whole planet in a pocket universe. The War Council doesn't think it can be done. That is, until every, single one of the Doctor's past regenerations (and one from the future!) arrive to combine their efforts.
-->'''The General:''' It's delusional! The--the calculations ''alone'' would take... hundreds of years!\\
'''Eleventh Doctor:''' Oh, ''hundreds'' and hun--\\
'''Tenth Doctor:''' --dreds, but don't worry. I started a '''very''' long time ago.\\
'''1[[superscript:st]] Doctor:''' [[SugarWiki/MomentOfAwesome Calling the War Council of Gallifrey; this is the Doctor!]]\\
'''Eleventh Doctor:''' You might say: '''[[WhamLine I've been doing this]] [[BadassBoast all my lives!]]'''
* ''Series/{{Farscape}}'': Past one-shot enemies were called upon to help the main characters rob a bank.
** And at the end the BigBad from the previous season shows up to save the day.
* ''Series/GameOfThrones'':
** In response to his father's imprisonment and the Lannister invasion of the Riverlands, Robb Stark calls all the Stark bannermen to assemble for war.
** Maester Aemon and Sam draft letters imploring ''all'' the factions of Westeros to help the Night's Watch stand against the White Walker's march on the Wall. Stannis answers.
** Jon Snow and Sansa Stark do this in season 6, hoping to rescue their youngest brother and liberate the North from Bolton rule, calling on wildings and noble alike. Most don't answer, and the ones that do aren't sold on loyalty (or gratitude in the free folks' case) alone, and rather there being a zombie apocalypse on the way.
** But ultimately played straight with the Vale Knights. At Littlefinger's suggestion, young Lord Robin Arryn agrees to send ''all'' his army to [[ThickerThanWater help his cousin Sansa]].
* ''Franchise/KamenRider'': The movie ''[[Series/KamenRiderOOO Let's Go Kamen Rider]]''. Faced with the Great Colossus that was stated to be unstoppable until it's [[OmnicidalManiac destroyed everything]], ALL of the Riders (whether a hero, villain, or neutral) from the series' 40-year history appear, in order to help finish off the Colossus with the [[CombinedEnergyAttack All Rider Break]]. If anyone's counting, that would be '''90''' Kamen Riders, more or less.
* ''Series/TheKidsOfDegrassiStreet'': Both subverted and played straight in the episode "Martin Meets the Pirates". Pete attempts to get neighborhood kids to help out against a street gang called the Pirates, but many are too scared or won't help Pete as he had [[NoodleIncident messed their bicycles up as part of a failed moneymaking scheme]]. Played straight later on when Martin rallies for help against the Pirates and succeeds, mainly because [[KickTheDog his little sister was targeted by the gang]].
* ''Series/LegendsOfTomorrow'': In the Season 3 finale, the Legends find themselves cornered in the Wild West by [[BigBad Mallus]] and about to face down [[LegionOfDoom his army]], and send out a temporal SOS. A response comes in the form of several allies made over the course of the season, and one former team member who was previously PutOnABus.
* ''Series/{{Leverage}}'': Done in [[spoiler:"The Last Dam Job"]]. Notable in that it is one of the few examples where the heroes are clearly not okay working with their enemies.
* ''Series/MadamSecretary'''s season three finale is titled "Article 5" after the mutual defense clause of the NATO Treaty, which Bulgaria invokes when Russian Spetsnaz operators disrupt its government and media in preparation for an invasion. France unexpectedly vetoes the move, [[spoiler:which Liz and Henry trace to the Russians having funded President Perrin's campaign, getting him impeached and forcing France to abstain in the second round of voting]].
* A strange corporate example occurs at the end of Season 3 of ''Series/MadMen''. When Sterling Cooper's British overlords at Putnam Powell & Lowe decide to sell the firm to [=McCann=] Erickson, Roger Sterling, Bert Cooper, and Don Draper instantly realize that they (and Don's creative talent) would be sidelined at [=McCann=]'s "sausage factory" of an ad agency. As a result, they rally a number of people to start a new firm: they get Lane Pryce -- who had had something of a strained relationship with them as PPL's representative in New York -- to fire them all in exchange for making him a partner in the new firm; they pull in Pete Campbell, whom Don still regards as too ambitious for his own good, to get his account skills and contacts at the lucrative Richardson-Vicks account; they get Peggy Olson, whom Don had recently insulted, to join as head of Creative; they get Harry Crane, the only man in the office smart enough to see the potential for having a TV division, as head of Media; and finally, they bring in the formerly-exiled Joan Harris as office manager, who scrounges up materials and people for the agency. And then, in a Midtown hotel room:
-->'''Joan''': Sterling Cooper Draper Pryce, how can I help you?
* Once Morgana takes over Camelot at the end of season three of ''Series/{{Merlin|2008}}'', Merlin writes to Lancelot, asking for his assistance. Lancelot arrives just in time, with Percival in tow, to save the company from a band of immortal soldiers by causing a rockslide.
* ''Series/MsMarvel2022'': In the finale, when Kamala and her friends face off against Damage Control, Zoe broadcasts online to her Tik Tok followers to get them to come to the school. Before the night is over, much of the population of Jersey City is there to show support for Kamala. Even the police end up joining the crowd against Damage Control in protest against their tactics.
* ''Series/MyNameIsEarl'', "Camdenites": Earl rounds up just about everyone he's ever helped with his list to help him right Joy and Darnell's trailer.
* Many times in the finales of the ''Franchise/PowerRangers'' series. But the most memorable is the one for ''[[Series/PowerRangersInSpace In Space]]'' series. In it the rangers are beaten and Andromeda issue an ultimatum to surrender themselves or she'll kill the citizens. When zero hour comes, who should actually stand up to her but Bulk and Skull [[IAmSpartacus proclaiming themselves to be Power Rangers]] More citizens of Angel Grove start doing likewise, inspired by their bravery. Eventually the Power Rangers themselves join in and a full on battle takes place between the citizens and Andromeda's forces. What makes it memorable is that its the non-powered characters that ultimately help achieve victory.
* Subverted in ''Series/RobinHood'': In the finale Robin and the gang are under siege at Nottingham Castle and they manage to sneak one of their people out in order to fetch [[UsefulNotes/RichardTheLionHeart King Richard's]] army who are rumoured to have landed back in England. However, the Sheriff soon informs them that Richard is in fact held hostage in Austria and no help is coming.
* An inversion for the series finale of ''Series/{{Seinfeld}}.'' When the four main characters are put on trial for violating the Good Samaritan Law, a long list of significant characters from the show's entire run are called as witnesses... for the prosecution.
* Series Two of ''Series/BlakesSeven'' ends with the crew of the Liberator calling on [[spoiler:the Federation]] to defend against [[spoiler:the Andromedan spacefleet]] -- and [[YouShallNotPass defending the pass on their own]] until help can arrive. The relationship between the allies was... not nice, shall we say?
* ''Franchise/{{Stargate|Verse}}'':
** One season finale for ''Series/StargateSG1'' had the Tau'ri, Free Jaffa Nation, Asgard, and Lucian Alliance (the last only agreeing to help after Teal'c beats the crap out of the leader's guards and points a gun at his forehead) band together to stop the Ori from gaining a foothold in their galaxy. In a rather shocking case of TheWorfEffect, the Ori outright slaughter the Milky Way alliance.
*** Made even worse by the fact that the Asgard were one of the most advanced races in the Milky Way, and even THEY were trying to desperately think of something fast to stop the Ori.
** A more successful alliance recently happened in ''Series/StargateAtlantis'', where the Atlanteans, their enemies the Wraith, and their allies the Travelers successfully [[spoiler:destroy the Replicator homeworld]], apparently losing only one ship in the process.
** In ''Film/StargateContinuum'', SG-1 (in F-15s) are attacked by gliders. They are saved by a squadron of Russian [=MiGs=], possibly one of the few cases in Western fiction where incoming [=MiGs=] are a good thing.
* Invoked ''and'' subverted in ''Series/StarTrekDeepSpaceNine'' when a combined Federation and Klingon fleet about to face an overwhelming force of Dominion and Cardassian warships en route to the Bajoran system aiming to retake Deep Space 9 as the first act of their new alliance are unexpectedly joined by Romulan warbirds decloaking and announcing they are there to assist. The subversion comes when it turns out the enemy fleet was a hoax: The whole thing had been a Dominion plan to gather those opposing them together and then destroy the whole system with a bomb planted by a mole. (It fails.)
* In the ''Series/{{Supernatural}}'' episode [[Recap/SupernaturalS09E01IThinkImGonnaLikeItHere "I Think I'm Gonna Like It Here" (S09, Ep01)]], Dean prays for help from the angels.
* ''Franchise/SuperSentai'': Expanding on the beginning of ''Series/KaizokuSentaiGokaiger'', the ''[[Film/GokaigerGoseigerSuperSentai199HeroGreatBattle 199 Heroes]]'' movie reveals that the [[Series/TensouSentaiGoseiger Goseigers]] are at first overwhelmed in battle by the Zangyack Empire's military might, which prompts the arrival of all previous Franchise/SuperSentai to help fight off the invasion.
* In the 1970s version of ''{{Series/Survivors}}'', the Whitecross settlement realise they're next in the path of a sniper who has randomly been killing the women of the surrounding communities. They send out a call to other settlements but get a lot of rejections... until a settlement leader who had been against the idea of co-operation at the start of the episode turns up with help, having realised it's in his best interests to get rid of the sniper before his people are next.
* ''Franchise/UltraSeries''
** The three-part ending of ''Series/UltramanMebius'' both subverts it and then promptly plays it straight. When [[EvilOverlord Empera]] sends his army down to Earth to wear down the heroes, eventually rendering Mebius near comatose and destroying most of GUYS' weapons and super-vehicles, the cast get the aid of their various allies they've made over the series. Only to have it amount to nothing as Empera arrives and kicks the crap out of them with a few flicks of his wrist -- eventually killing [[TheLancer Ultraman Hikari]] and [[EnsembleDarkHorse Zamusha]] before vaporizing Mebius with a [[FinishingMove Rezolium Ray]]. A few of them get better, and they get a true GondorCallsForAid from the Ultra-Brothers and a few of the slain are NotQuiteDead, and the world is saved.
** ''Series/UltramanGaia'' also gets one, though it's far more effective. All of Earth's monsters awaken to fight [[BigBad Zogu's]] (aka [[NamesToRunAwayFromReallyFast The Root Of Destruction]]) army after Gaia and Agul are defeated, XIG ultimately helping them. In the end, they lend some of their energy to Gaia and Agul to revive and super charge them, allowing them to put an end to Zogu once and for all.
* ''Series/WalkerTexasRanger'':
** In Season 9's "[[Recap/WalkerTexasRangerS9E13DivisionStreet Division Street]]", ex-con-turned-community center director Boomer Knight (played by Creator/HulkHogan) is kidnapped by a gang of drug dealers led by the villain, Carson. Danny, whose brother belongs to the Blades Gang, witnesses the kidnapping occur and he and Jeff, whose cousin belongs to the rival gang, the Guardians, notify their respective gangs of what happened, to which both gangs realize after they refused to deal drugs for Carson anymore after the community center brought them together, Carson would frame them for Boomer's murder. While the two gangs go to Carson's hideout, Danny and Jeff tell the Rangers what happened. When the gangs come bursting into Carson's hideout and beat up the henchmen, they release Boomer from his noose and threaten to hang Carson instead. [[IfYouKillHimYouWillBeJustLikeHim Boomer tells them not to do it, as they will end up in prison like he did.]] The gangs release Carson from the noose, seconds before Danny and Jeff come storming in with the cavalry to arrest him and have him indicted for drug dealing and Boomer's attempted murder.
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