Full Episode Descriptions for The CW’s DC Invasion Crossover

The CW has released all four episode descriptions for the upcoming crossover between Supergirl, The Flash, Arrow, and DC’s Legends of Tomorrow.

Titled “Medusa,” the Supergirl episode that kicks things off on Monday, November 28 is described as follows:

“Eliza (guest star Helen Slater) comes to town to celebrate Thanksgiving with her daughters. Alex (Chyler Leigh) decides it’s time to come out to her mother; Kara (Melisa Benoist) is shocked when Eliza suggests Mon-El (Chris Wood) has feelings for her, and Winn (Jeremy Jordan) and James (Mehcad Brooks) consider telling Kara the truth about the Guardian. Meanwhile, CADMUS unleashes a virus that instantly kills any alien in the vicinity so Kara enlists an unexpected ally – Lena Luthor (Katie McGrath). The epic superhero crossover kicks off tonight when Barry Allen (guest star Grant Gustin) and Cisco Ramon (guest star Carlos Valdes) seek Kara’s help with an alien invasion on their Earth.”

Titled “Invasion!” The Flash episode that follows on Tuesday, November 29 is described as:

“When aliens called the Dominators attack Central City, Barry (Grant Gustin) speeds over to Star City to ask the Green Arrow (guest star Stephen Amell) for help in stopping them. Realizing the battle against the Dominators is bigger than they thought, they track down the Legends of Tomorrow, and Barry and Cisco (Carlos Valdes) create a breach to bring back a secret weapon – Supergirl (guest star Melissa Benoist). 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 (Keiynan Lonsdale) wants to join the battle against the aliens but Iris (Candice Patton) tells him he’s not ready.”

Also titled “Invasion!” the Arrow episode on Wednesday, November 30 is described as:

“Oliver (Stephen Amell) wakes up to a life where he never got on The Queen’s Gambit. Robert (guest star Jamey Sheridan) and Moira Queen (guest star Susanna Thompson) are alive and well. Laurel (guest star Katie Cassidy) is his loving fiancée and their wedding is imminent. Everything seems perfect, but Oliver starts to notice small imperfections that make him question this new reality. Meanwhile, Felicity (Emily Bett Rickards) and the recruits take on a new threat with help from The Flash (guest star Grant Gustin) and Supergirl (guest star Melissa Benoist).”

Finally, the DC’s Legends of Tomorrow episode that concludes it all on December 1 is titled, you guessed it, “Invasion!,” and is described as:

“After learning the Dominators’ plan for the world, the Legends must work together with The Flash (guest star Grant Gustin), Supergirl (guest star Melissa Benoist) and Green Arrow (guest star Stephen Amell) to kill them once and for all. Meanwhile, Stein (Victor Garber) 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. Brandon Routh, Franz Drameh, Dominic Purcell, Maisie Richardson-Sellers, Nick Zano and Caity Lotz also star.”

The Invasion crossover event will feature the likes of Stephen Amell as Oliver Queen/Green Arrow, Melissa Benoist as Kara/Supergirl, Grant Gustin as Barry Allen/The Flash, plus Caity Lotz as Sara Lance/White Canary, Nick Zano as Nate Heywood/Steel, Maisie Richardson- Sellers as Amaya Jiwe/Vixen, Dominic Purcell as Mick Rory/Heat Wave, Brandon Routh as Ray Palmer/Atom, David Ramsey as John Diggle, Carlos Valdes as Cisco Ramon, Emily Bett Rickards as Felicity Smoak, and the return of Katie Cassidy as Laurel Lance.