After Dr. Deegan takes another shot at rewriting reality Oliver and Barry find themselves on the run from the law, with Kara locked up inside Star Labs — and a dark Superman reigning supreme.

U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.

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THE BATTLE CONCLUDES

Supergirl (Melissa Benoist), The Flash (guest star Grant Gustin), Green Arrow (guest star Stephen Amell) and Superman (guest star Tyler Hoechlin) engage in the battle of their lives.

Jesse Warn directed the episode with story by Marc Guggenheim and teleplay by Derek Simon & Robert Rovner (#409).