|"Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."|
- For other uses of "Invasion!", see Invasion! (disambiguation).
- "That's what you've all proven here. Meta-humans or not, superpowers or not... you are Earth's mightiest heroes."
- —Kara Danvers
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.
Preparation ran from September 16 until September 26, 2016. Shooting ran from September 27 until October 12, 2016, with a break for Canadian Thanksgiving on October 10.
- This is the first crossover episode of .
- When Agent "Glasses" Smith tells the team about the Dominators, he calls them Xenomorphs, a reference to the Alien film franchise.
- When Felicity Smoak and Cisco Ramon get on the Waverider, they say, "This ship is... (Felicity); Automatic (Cisco); Supersonic (Felicity); Hypnotic (Cisco); Funky Fresh (both)". This is referencing Ciara and Missy Elliots' song 1, 2 Step.
- The Dominators visited Earth in 1951, landing in Redmond, Oregon. Oregon also happened to be the U.S. state where the potential existence of alien life was introduced on the TV show The X-Files during the pilot episode back in 1993.
- The Dominators first appearing on Earth in 1951 may be a reference to Area 51, a U.S. Air Force base which, according to a popular conspiracy theory, is kept secret by the government because aliens have been spotted there.
- When Ray looks at Kara, he tells Felicity that she reminds him of his cousin. This is a reference to the fact that Brandon Routh portrayed Superman in the 2006 film, Superman Returns.
- It's revealed in this episode that Barry is the winner of the duel between him and Oliver at the end of "".
- The name of Martin Stein's daughter is revealed as Lily Stein.
- It's revealed in this episode that Cisco can "vibe" another person with him without tech equipment.
- Kara calls the superheroes in Earth-1 "Earth's Mightiest Heroes". This is the nickname of Marvel's Avengers, who are in charge of protecting the Earth from superhuman threats.
- When Felicity is linguistically challenged after the time jump, at one point she says ,"Darmok and Jalad at Tanagra" really fast. This is a reference to the well-known Star Trek TNG episode "Darmok", in which the aliens speak entirely in metaphors. The phrase she spoke means "working together" in the metaphor-based language.
- Another Star Trek reference is made when Cisco says, "Set your phasers to stun."
- This episode marks the first official appearance of The Flash on , though his voice was heard in "" and "".
- Mick tells Barry that " But when you got a crew, you gonna take a hit for the rest." This bears a resemblance to what Leonard Snart told the Legends back in "": "If you take out one of [his] crew, you pay the price." This shows that Mick does indeed have a sense of honor similar to Snart's.
- In the original draft of the episode, Lynda Carter was intended to play the new POTUS of Earth-1, acting as a doppelgänger of Olivia Marsdin, who is the POTUS of Earth-38. At the suggestion of the studio, the role was changed, as they thought it would be too confusing. Eventually, Lucia Walters got the role, and an original character was created.
- When Nate, Amaya, and Mick land in Oregon in 1951 and leave Cisco and Felicity on the Waverider before the three go to find a Dominator, Nate says, "Have fun storming the castle.". This is a quote from the 1987 film The Princess Bride, which Cisco notices and objects to Nate using the film against him.
- When they manage to capture a Dominator, Mick starts burning it with his Heat Gun and says "Squeal, you pig!". This is possibly a reference to a famous quote from the 1972 film Deliverance.
- When Kara leaves after talking to Agent Smith about his reassignment to Antarctica, Nate tells him that next time, he should be "a little nicer to strange visitors from another planet." This could be a reference to the first season episode "" and is also the tagline from the original Adventures of Superman TV series.
- Cisco refers to a Dominator as "E.T.", an alien from the 1982 film E.T. the Extra-Terrestrial.
- Felicity says, "Oh, frak.", which is a fictional version of "fuck" first used in the 1978-Battlestar Galactica television series.
- Caitlin says to Professor Stein, "You're really taking this whole Absent-Minded Professor thing to a new level." This is a reference to the 1961 film The Absent-Minded Professor.
- Cisco asks Felicity if she has seen the TV show Stranger Things, indicating that the show exists on Earth-1.
- ↑ “Invasion!” Descriptions For The CW’s Four-Show DC Crossover Episodes - KSiteTV
- ↑ Marc Guggenheim (@mguggenheim) - Twitter
- ↑ Why Supergirl's Lynda Carter Wasn't In The Big DC TV Crossover As Planned - Cinemablend
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