History Recap / LegendsOfTomorrowS2E7Invasion

* MythologyGag: Felicity uses the "This is a job for..." phrase to Supergirl ([[MyFriendsAndZoidberg and Flash]]) that is popularly used to refer to Franchise/{{Superman}}.

** Kara calls her new friends "Earth's Mightiest Heroes". Uh, [[Franchise/TheAvengers wrong team]]...

* NotGoodWithPeople: Oliver flat out admits to Kara that when he deals with something new ([[DifferentlyPoweredIndividual metahumans]], now an AlienInvasion and TheMultiverse) he has a tendency to push back and "claw back a sense of normalcy", which is why he benches her for a time.

* FiveManBand: The group who travels to 1951; Mick is TheLeader, Amaya is TheLancer, Nate is TheBigGuy, Cisco is TheSmartGuy, and Felicity is TheChick.

!! Tropes in this episode include:

* AbsenteeActor:
** Thea went back to Star City between the last installment and this one.
** Iris, Wally, H.R., and Joe don't appear. They only appeared in ''The Flash'' episode of the crossover.
** Curtis, Rene/Wild Dog, and Rory/Ragman only appear in the Arrow crossover episode.

* JerkassRealization: After Cisco goes back to 1951 and saves the captured Dominator from torture and death, he's informed by the same Dominator in 2016 that its escape resulted in the confirmation of the existence of metahumans on Earth. Cisco recognizes he altered the timeline for what he thought was a good reason and thus he [[StableTimeLoop bears some responsibility for why the Dominators came back to Earth in 2016 to wipe out Barry and all metahumans]]. This makes him realize that [[NotSoDifferent he can't continue to blame Barry for doing the same thing when his own actions could have a result]]--[[MyGodWhatHaveIDone millions of deaths, if not the total extinction of humanity]]--immeasurably worse.

* NotSoDifferent:
** At the end of the episode, Cisco forgives Barry because he also unwittingly made things worse by changing the past.
** Stein, [[{{Hypocrite}} who has been the most adamant in telling Sara not to kill Damien Darhk for personal reasons]], decides not to fix his time aberration because he doesn't want to lose his daughter.

* RealityEnsues: Other than [[SuperWeaponAverageJoe Mick]], who has a [[FireBreathingWeapon flamethrower]] powerful enough to hurt [[SuperSpeed the Flash]], the {{Badass Normal}}s are barely a threat to the Dominators. [[BigGood Oliver]] is even nearly killed by just one of them.

** Iris, Wally, H.R., and Joe don't appear. They only appeared in the ''Flash'' episode of the crossover.

* AccidentalAesop: Happens InUniverse in this episode. Dr. Stein recounts the story of AndroclesLion, but he seems to think that the moral of the story is, "big enemies can be hurt by little things."

* BrickJoke: Heat Wave calls Supergirl "Skirt," just as he promised two episodes back.

* BullyingADragon: The CIA trying to capture The Fastest Man Alive, a guy in superpowered armor, and two of the biggest {{Badass Normal}}s in the world. This couldn't end well.

** Averted. It was widely speculated that the alien-killing bioweapon, Medusa, introduced in the ''Supergirl'' episode that began the crossover would be employed against the Dominators (especially with Supergirl revealing in the ''Flash'' episode that they exist in her universe, too). Ultimately, while the episode ''does'' feature a bioweapon targeting a specific group, it's deployed by the Dominators, who are subdued using a totally unrelated method.

* ColdBloodedTorture: Mister Smith looks almost gleeful at the idea of testing how closely a Dominator nervous system is similar to a human's by inducing pain.

** Oliver mentions there were [[CliffHanger no witnesses]] to his second fight with Barry.

** When Felicity is stuck temporarily speaking gibberish due to temporally-induced aphasia, one of the random things she yells is [[Recap/StarTrekTheNextGenerationS5E2Darmok "DarmokAndJaladAtTanagra!"]]

* TookALevelInBadass: Firestorm is now able to trans-mutate larger objects, with difficulty.

* TheUnreveal: Referenced in universe when Oliver claims he can take Barry, and Barry's claim their previous two fights prove otherwise are wrong because [[Recap/TheFlash2014S1E8FlashVsArrow the first time they fought]] it was a tie (even though it didn't really come off as one on Barry's end), and [[Recap/ArrowS3E8TheBraveAndTheBold the second time]] there were no witnesses. However, the way Oliver says the latter, it is made clear that Barry won that second one.

** Part of the group travels to 1951 during the first AlienInvasion attempt.

* TheWorldIsAlwaysDoomed: [[LampshadedTrope Lampshaded]].

* AndThenWhat: Barry tells Oliver that they should hang out more often, not just when the world is in danger. Oliver then asks him what they would do if the world didn't need saving. The answer is drink.

* AscendedMeme: The Arrowverse finally acknowledges the strong resemblance between Felicity and Kara (in her civilian attire) that fans noticed since ''Series/Supergirl2015'' first began airing.

** Played straight with the "breach crosser" Cisco gives Kara, as it was announced way before the the 4-part {{Crossover}} aired that there will be a MusicalEpisode {{Crossover}} between ''Series/{{The Flash|2014}}'' and ''Series/{{Supergirl 2015}}''.

* {{Foreshadowing}}: Cisco gives Kara a "breach crosser". It was also announced that there will be a MusicalEpisode {{Crossover}} between ''Series/{{The Flash|2014}}'' and ''Series/{{Supergirl 2015}}''.

[[caption-width-right:350:And you [[Recap/ArrowS4E8LegendsOfYesterday still thought]] you'd have to wait until 2017 to see the Film/JusticeLeague, didn't you?]]

* RippleEffectProofMemory: An extremely [[TearJerker tragic]] example of this trope. Prof. Stein has no memory of his daughter because from ''his'' perspective, she only just started existing. However, from everyone else's perspective, including Lily herself, Stein has been a loving father to her for nearly 30 years. This is similar to how Barry has supposedly "known" Julian Albert for over a year despite just meeting him from his perspective, although portrayed in a considerably more serious light.

* PresidentMinority: The new president is a TwoferTokenMinority, being both female and African American.

-->'''Cisco:''' Oh, you're gonna use ''Princess Bride'' against me? Against [[PopCulturedBadass ME?!]]

[[caption-width-right:350:And you [[Recap/ArrowS4E8LegendsOfYesterday still thought]] you'd have to wait until 2017 to see the ''Film/JusticeLeague'', didn't you?]]

After learning the Dominators' plan for the world, the Legends must work together with the Flash, Supergirl and Green Arrow to kill them once and for all. Meanwhile, Stein figures out, with the help of others, how the team can terminate the Dominators, but is distracted by the aberration he realizes he created in 1987.

** Iris, Wally, H.R, and Joe also don't appear. They only appeared in the Flash episode of the crossover.
** Also Curtis, Rene/Wild Dog, and Rory/Ragman only appear in the Arrow crossover episode.
* AccidentalAesop: Happens InUniverse in this episode. Dr. Stein recounts the story of AndroclesLion, but he seems to think that the moral of the story is, "big enemies can be hurt by little things".
* AgeCut: A cut from 1951 to the present day is used to show past Mr. Smith is the belligerent government official menacing the Flash and company.
* AndStarring: The "Special Guest Stars" lineup ends "With Creator/MelissaBenoist and Creator/GrantGustin".

* AscendedMeme: The Arrowverse finally acknowledges the strong resemblance between Felicity and Kara (in her civilian attire) that fans noticed since ''Series/{{Supergirl}}'' first began airing.

* BlatantLies: The Dominators claim turning Barry over to them will make them go away, but it's clear they were fully intending to launch the metabomb anyway since their issue is with the existence of metahumans overall, not just Barry.
* {{Bookends}}: With the Supergirl episode, which also features a powerful bioweapon that targets a certain group (aliens, in the earlier case).
* BrickJoke: Heat Wave calls Supergirl "Skirt", just as he promised two episodes back.
* BulletCatch: Barry does this with almost contemptuous ease.
* BullyingADragon: The CIA trying to capture The Fastest Man Alive, a guy in superpowered armor and two biggest {{Badass Normal}}s in the world. This couldn't end well.

** Averted. It was widely speculated that the alien-killing bioweapon, Medusa, introduced in the Supergirl episode that began the crossover would be employed against the Dominators (especially with Supergirl revealing in the ''Flash'' episode that they exist in her universe, too). Ultimately, while the episode ''does'' feature a bioweapon targeting a specific group, it's deployed by the Dominators, who are subdued using a totally unrelated method.
** Played straight with the "breach crosser" Cisco gives Kara, as it was announced way before the the 4-part {{Crossover}} aired that there will be a MusicalEpisode {{Crossover}} between ''Series/TheFlash2014'' and ''Series/{{Supergirl 2015}}''.

* ConflictBall: Ollie gets a sudden and inexplicable dislike for Supergirl just so that she can have her own subplot based on an interpersonal conflict (like the other main characters have in this crossover), and also because the [[StoryBreakerPower missions would have went differently if she was allowed to participate]]. This conflict then gets solved as quickly as it was introduced, when Kara saves Ollie's life in the final battle.

* CryForTheDevil: When they hear him screaming in pain, Cisco decides that the group should rescue the Dominator from his torture. Unfortunately, rescuing it means that the Dominators now know Earth has metahumans.

* DoesThisRemindYouOfAnything: Caitlin and Prof. Stein's discussion about the latter's daughter being a Time Aberration and the implication that she should be erased is essentially like discussing abortion or disposing of an unwanted child.

* FantasticRacism: The Dominators believe all [[DifferentlyPoweredIndividual Metahumans]] are a potential threat, invoking the SuperHeroParadox.
* TheFifties: Part of the group travels to 1951, where the first AlienInvasion occurred.

* {{Foreshadowing}}: Cisco gives Kara a "breach crosser". It was also announced that there will be a MusicalEpisode {{Crossover}} between ''Series/TheFlash2014'' and ''Series/{{Supergirl 2015}}''.

** This episode as stated also has Cisco forgiving Barry for Flashpoint and it leading to his brother's death.
* GilliganCut: When Barry suggests they should hang out more often, Oliver asks what they could ''possibly'' do that didn't involve some kind of threat to the world. SmashCut to the two of them sitting in a bar just having a beer.

* IdTellYouButThenIdHaveToKillYou: Mr. Smith says this to The Flash and the other heroes he's with, which would sound badass if he weren't so utterly clueless as to how outmatched he is.

* JerkassRealization: After Cisco goes back to 1951 and saves the captured Dominator from torture and death, he's informed by the same Dominator in 2016 that its escape resulted in the confirmation of the existence of metahumans on Earth. Cisco recognizes he altered the timeline for what he thought was a good reason and thus he [[StableTimeLoop bears some responsibility for why the Dominators came back to Earth in 2016 to wipe out Barry and all metahumans]]. This makes him realize that [[NotSoDifferent he can't continue to blame Barry for doing the same thing when his own actions could have a result]] -- [[MyGodWhatHaveIDone millions of deaths, if not the total extinction of humanity]] -- immeasurably worse.

** Right after Felicity notices how much she and Kara look alike, Ray mentions that she kinda looks like his cousin. Creator/BrandonRouth played The Man of Steel in ''Film/SupermanReturns''.

* TheMenInBlack: Mister Smith is all over this trope. Also, at the end, Kara tells the President about the DEO on her Earth, and the President likes the idea, which may lead to such agency being founded on Earth-1 as well.

-->'''Kara''': I think hardship is what makes us stronger. That's probably why these people look to [[TheCowl you]] as their [[TheReliableOne rock]].
* MyFriendsAndZoidberg: Felicity towards Barry, [[DudeWheresMyRespect much to his disdain]]. Speaking of which...
-->'''Felicity:''' "This is a job for Supergirl! And Flash.
* MythologyGag: Felicity uses the "This is a job for..." phrase to Supergirl ([[MyFriendsAndZoidberg and Flash]]) that is popularly used on Franchise/{{Superman}}.
* NoGoodDeedGoesUnpunished: By saving the Dominator in the past, Cisco showed them that metahumans exist on Earth and are a threat.

** At the end of the episode, Cisco forgives Barry because he also unwillingly made things worse by changing the past.

** After the events of the last episode, Oliver, Ray, Sara, Diggle, and Thea had their costumes/suits replaced with unisex grey clothing after the Dominators abducted them. Here, their costumes/suits have returned. While at least part of this can likely be chalked up to the Waverider's ability to create new clothing, Ray's A.T.O.M. suit definitely ''can't'', so the fact that he [[Recap/TheFlash2014S3E8Invasion once again]] made a new A.T.O.M. suit from scratch in a very short period of time is extremely impressive.[[note]]Recall that at the end of [[Recap/LegendsOfTomorrowS2E6OutlawCountry Outlaw Country]] he said that he had enough Dwarf Star to power ''20'' A.T.O.M. suits, so he probably won't run out of that any time soon.[[/note]]
** After the Legends that traveled back to 1951 are captured, Cisco and Felicity manage to ambush their way to where they are with some guns they found on the ship. All we hear of it is some shooting noises before they burst in through the door.

** Nate quotes ''Film/ThePrincessBride'' "I'll take that as, "Have fun StormingTheCastle"". Given a LampshadeHanging by Cisco in this case.

* * SpecialEditionTitle: All three parts of the "Invasion!" crossover arc (excluding Supergirl) had special title cards. This and the first part combines all four series' logos, but this being a Legends of Tomorrow episode, ends on its own title.
* SpottingTheThread: Perhaps thanks to how she saw Barry having the same reactions when he restored the timeline after "Flashpoint," Caitlin sees how Stein is awkward around his daughter, not catching on her obvious references and figures out that somehow, Stein has no idea who Lilly is. She confronts him on it so he confesses how she shouldn't actually exist.
* StoryBreakerPower: Supergirl is conveniently not on the trip back to 1951 (where she would have easily saved the team from Smith and his other agents) and not with Oliver's group in 2016 when they're ambushed by Smith and which ended up being a CurbStompBattle even without her there. To its credit, the episode includes a sequence in which Oliver explains why Kara is being "benched" on these two missions (though for more selfish and self-conscious reasons).
* TimeShiftedActor: Done with Mister Smith.
* TookALevelInBadass: Firestorm is now able to trans-mutate larger objects.

* VomitDiscretionShot: Felicity puked twice in the Waverider, but nothing is shown.
** As he is leaving, Rory tells Cisco to clean it up, with a tone of "hey, she's ''your'' friend,"
* WaxingLyrical: Cisco and Felicity briefly quote the lyrics to "One Two Step" by Ciara.

* WhereItAllBegan: Part of the group travels to 1951 during the first AlienInvasion attempt.
** Sara also mentions to Oliver that the whole adventure (The Arrowverse) started when the two of them got on ''The Queen's Gambit.''
* WhatMeasureIsANonHuman: Addressed in Lilly. As far as Stein is concerned, she's just a "time aberration" and he intends to erase her as soon as possible. Caitlin presses him to understand that Lilly is a real person who loves her father dearly and her existence can't be forgotten like that. Talks with Lilly make Stein realize his life is better with her and to let her stay even if he can't remember her.

'''Barry:''' [[Recap/TheFlash2014S2E23TheRaceOfHisLife Mmhm]].\\
'''Oliver:''' [[Recap/ArrowS4E23Schism Last year]].\\

* SaveTheVillain: Cisco decides to rescue a Dominator that got captured by the MenInBlack. [[NiceJobBreakingItHero Unfortunately]], [[StableTimeLoop this is what leads to the invasion happening in the present]].

-->'''Cisco:''' Oh, you're gonna use ''Princess Bride'' against me? Against ME?!

* EvenTheGirlsWantHer: Mick and Sara agree that the new President is hot.