Oliver, Barry, and Kara head to Gotham City to search for the scientist who might be behind their reality-bending predicament, and find a Caped Crusader watching over the city in Batman’s absence. Cisco and Caitlyn team up with Felicity and Curtis in Star City, which has fallen victim to a strangle lightning phenomenon.

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 ELSEWORLDS CROSSOVER CONTINUES IN GOTHAM CITY WITH BATWOMAN (RUBY ROSE)

With Oliver (Stephen Amell) and Barry (guest star Grant Gustin) still stuck in the other's bodies, the two get a lead on John Deegan (guest star Jeremy Davies) and head to Gotham City with Supergirl (guest star Melissa Benoist) to figure out why their reality has changed. While there, they meet the mysterious Kate Kane (guest star Ruby Rose) who provides them with information that leads the group to Arkham Asylum.

James Bamford directed the episode with teleplay by Marc Guggenheim and story by Caroline Dries (#709).