Question: what episodes should i watch before crisis on infinite earths?
Answer: Arrow 1.01 Pilot. Arrow 2.08 The Scientist. Arrow 2.09 Three Ghosts. The Flash 1.01 Pilot. The Flash 1.08 Flash vs. Arrow. Arrow 3.08 The Brave and the Bold. Supergirl 1.01 Pilot. The Flash 2.08 Legends of Today.