Oliver and Barry discover that they've swapped bodies. To find someone who can recognize them for who they are, they travel to Earth-38 to get Kara's help. Before they can solve the mystery of the mind-swap, the heroes have to take down a new menace: AMAZO, a robot with all of their powers.
Season Number: 5
Episode Number: 9
Episode Title: Elseworlds, Part 1
Air Date: Dec 9, 2018