Well, that was fast. The CW has given an early fourth season renewal for The Flash TV show. Season four of the popular superhero series will air during the 201718. Aliens showdown technically kicks off at the tail end of Supergirls Nov. Lena Luthor helping the DEO ward off an alien virus, while Alex comes out to her mother guest star Helen Slater. Empires review of the Supergirl, Arrow, The Flash and Legends Of Tomorrow crossover event, Invasion. A list of crossover episodes which involve characters or plotlines from multiple shows in the shared multiverse. They are arranged chronologically, grouped by season. The Arrow, Flash, Supergirl, and Legends of Tomorrow crossover will adapt the 1980s Invasion The Flash was renewed for a fourth season by The CW on January 8, 2017. Arrow_season_4_SDCC_poster.png/revision/latest?cb=20150710053518' alt='Arrow Flash Crossover Season 4' title='Arrow Flash Crossover Season 4' />The Flash episode appears to rewind a bit to set up Barry and Ciscos recruitment of Supergirl from her Earth, while Arrows 1. I have to say, seems a bit of a disconnect, busy as it is marking that series milestone. I trust it will make sense in the end, but I have to wonder if they should have instead somehow cheated the math and celebrated No. RELATED By looping in his younger self Supergirl, Medusa airing Monday, Nov. The epic superhero crossover kicks off tonight when Barry Allen guest star Grant Gustin and Cisco Ramon guest star Carlos Valdes seek Karas help with an alien invasion on their Earth. The Flash, Invasion Tuesday, Nov. When aliens called the Dominators attack Central City, Barry 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 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 wants to join the battle against the aliens but Iris tells him hes not ready. Arrow, Invasion Wednesday, Nov. Oliver wakes up to a life where he never got on The Queens 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 fianc. Watch The Secret Disco Revolution IMDB on this page. Everything seems perfect, but Oliver starts to notice small imperfections that make him question this new reality. Meanwhile, Felicity and the recruits take on a new threat with help from The Flash and Supergirl. DCs Legends of Tomorrow, Invasion Thursday, Dec. 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 1. Want scoop on any of the above shows Email insidelinetvline. Matts Inside Line.