Question: which episode of supergirl is crisis on earth x
Answer: Supergirl ( part 1 ) Season 3 , Episode 8 Arrow ( part 2 ) Season 6 , Episode 8 The Flash ( part 3 ) Season 4 , Episode 8 Legends of Tomorrow ( part 4 ) Season 3 , Episode 8 Directed by Larry Teng ( Supergirl ) James Bamford ( Arrow ) Dermott Downs ( Flash ) Gregory Smith ( LoT ) Story by Andrew Kreisberg Marc Guggenheim Teleplay by Robert Rovner ( Supergirl ) Jessica Queller ( Supergirl ) Wendy Mericle ( Arrow ) Ben Sokolowski ( Arrow ) Todd Helbing ( Flash ) Phil Klemmer ( LoT ) Keto Shimizu ( LoT ) Original air dates November 27 , 2017 ( 2017 -