Invasion! (The Flash) title card "Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."

Cisco Ramon[src]

This episode is part of a larger crossover series, Invasion!.

For other uses of "Invasion!", see Invasion! (disambiguation)
"We're going up against a bunch of aliens, and you want to tell people that their lives might have been affected by time travel? One sci-fi problem at a time."
Oliver Queen
"Invasion!" is the eighth episode of the third season of The Flash, and the fifty-fourth episode overall. It aired on November 29, 2016.

The episode is the second of the four-part crossover, Invasion!, with the eighth episode of the second season of Supergirl, eighth episode of the fifth season of Arrow and seventh episode of the second season of DC's Legends of Tomorrow​​.


When aliens called the Dominators attack Central City, Barry speeds over to Star City to ask the Green Arrow for help in stopping them. Realizing the battle against the Dominators is bigger than they thought, they track down the Legends, and Barry and Cisco create a breach to bring back a secret weapon – Supergirl. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust. Meanwhile, Wally wants to join the battle against the aliens but Iris tells him he's not ready.[1]


  • Martin Stein is revealed to have a daughter following the alterations to his personal timeline in "Compromised"​.
  • The way Barry asked for Team Arrow's help is very similar to the way he asked them on the previous crossover, "Legends of Today". In both episodes, Barry saves Team Arrow members whilst they are in the middle of a mission, resulting in Diggle throwing up, before explaining why he needs their help.
  • When asked what he saw, Barry describes that it was "enough to give Ridley Scott nightmares", referencing the director of the 1979 film Alien.
  • This is the first appearance of Martin Stein and Jefferson Jackson on The Flash since Season 2's "The Fury of Firestorm" and Mick Rory since "Rogue Time". Ray Palmer returns after appearing in Season 1's "All Star Team Up".
  • It is revealed that Iris still has a crush on Oliver since "Flash vs. Arrow".
  • The scene where Barry and Cisco recruited Kara was recycled from the Supergirl episode "Medusa".
  • Barry and Cisco both mention the events of "Worlds Finest", particularly the fact that Barry and Kara's race was a tie.
  • When Barry went to ask Team Arrow's help, Oliver asked him (rhetorically) if he needs help with "another evil speedster". This is a reference to "Rogue Air", where Oliver helped Barry battle the Reverse-Flash. Barry begins to answer that that is something he could use Oliver's help with (because of Savitar), only to change his mind and tell Oliver about the Dominators.
  • Barry notes that Vigilante was about to "Scarface" Oliver and Diggle. This is a reference to the infamous final scene of the 1983 film Scarface, in which protagonist Tony Montana fires a hail of bullets at his enemies.
  • Thea states that Barry claimed Kara to be "more powerful than a locomotive", referencing the traditional Superman catchphrase.
  • Oliver mentioned his parents' deaths, which happened in Template:Ep/Pilot (Robert Queen) and Template:Ep/Seeing Red (Moira Queen).
  • The message from future Barry, which first appeared on "Shogun", is finally revealed.
    • The message is later revealed in "Cause and Effect" to be a warning about Savitar, an evil future version of Barry.
  • Diggle finally finds out that his son J.J. was a result of Flashpoint, which Barry and Felicity found out in "Paradox". In the same episode, Barry tells Felicity about Cisco losing his brother as a result of Flashpoint. Felicity doesn't reply, giving a small hint that she already knew but didn't want to upset him.
  • This episode marks the third time Oliver ran out of arrows during a fight. He previously did so in Arrow season 1's "Betrayal" and season 4's "Brotherhood".
  • The hangar at which the heroes gather is a reference to the Hall of Justice, a headquarters for the Justice League.
  • The name of Supergirl's Earth is finally designated as "Earth-38", which is a reference to Superman's comics debut in 1938.
  • H.R. claims that if he helped Wally to train, he would be "gone faster than humor in a Liam Neeson movie". This is a reference to how Liam Neeson tends to star in dark, gritty action films.
  • Due to Flashpoint, the writer of the future newspaper is revealed to have changed; now being written by Julie Greer instead of Iris West-Allen. In the comics, Julie Greer is a reporter for KN News in Keystone City.
  • When Barry asks Ray about Leonard Snart, Ray mentions Snart's heroic sacrifice at the end of "Destiny".
  • Ray mentions to Cisco that his new A.T.O.M. suit is made of Old West Dwarf star, which the Legends collected following their adventure in "Outlaw Country"​​​.
  • Caitlin tells Stein that she attacked her friends using her powers, referencing the events of "Killer Frost".
    • Cisco still can't forgive Barry after the revelations revealed during that episode and his actions trigger the later events in this episode.
  • Wally runs at Mach 2, the same as Barry did in "Fast Enough".
  • In the Arrow season 2 episode "The Scientist" (which sees Team Arrow dealing with people who've gained superhuman abilities due to having been injected with Mirakuru), when Oliver tells Dig and Felicity that he's encountered Mirakuru-enhanced individuals before, he describes the Mirakuru as a serum designed to create human weapons. John then says "Human weapons? My God, what's next; aliens?" In this situation, that's exactly what Team Arrow (alongside Supergirl, Team Flash and the Legends) ends up dealing with.
    • Furthermore, "The Scientist" also introduced Barry Allen. Now, when Barry goes to ask Team Arrow to help him battle the aliens, John says "I swear to God Barry; my life was somewhat normal before I met you"; a possible nod to the fact that John and the rest of Team Arrow first encountered strange things like Mirakuru soldiers around the same time that they first met Barry.



  1. The Flash Crossover Episode Description: “Invasion!” - FlashTVNews
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