DC's Legends of Tomorrow (2016)

S05E01 Crisis on Infinite Earths: Part Five (V)

"Worlds were created, worlds were destroyed. Everything has changed forever." The crossover begins with Supergirl Season 5, Episode 9, titled "Crisis on Infinite Earths: Part One," followed by Batwoman Season 1, Episode 9, "Crisis on Infinite Earths: Part Two," then The Flash Season 6, Episode 9, "Crisis on Infinite Earths: Part Three," and finally Arrow Season 8, Episode 8, "Crisis on Infinite Earths: Part Four."