For this one, you're going to watch Supergirl season 2 episodes 1-7. Next, watch The Flash season 3 episodes 1-7, then Arrow season 5 episodes 1-7, and Legends of Tomorrow season 2 episodes 1-6. For this crossover, it starts with Supergirl season 2 episode 8, The Flash season 3 episode 8, Arrow season 5 episode 8, and last but not least, Legends of Tomorrow season 2 episode 7. Now you can watch Supergirl season 2 all the way through, The Flash season 3 all the way through, Arrow season 5 all the way through, and Legends of Tomorrow all the way through!
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A Complete Guide on Watching The DC Shows on CW
RandomThis is an unofficial guide, made by me on how to watch Arrow, The Flash, Supergirl, Legends of Tomorrow, Black Lightning, Batwoman, StarGirl, Constantine, and Superman & Lois