​In the season finale of The CW’s Supergirl, Kara (Melissa Benoist) fights for everything she believes in when she takes on Rhea (guest star Teri Hatcher) in a winner-takes-all battle for the fate of the Earth.

The extended trailer also features a first look at General Zod (Mark Gibbon), and Supergirl fighting Superman (guest star Tyler Hoechlin). And Kara’s former boss, Cat Grant (guest star Calista Flockhart) offers her a boost of confidence before she faces this test.

The Supergirl season finale airs Monday, May 22, at 8 p.m. on The CW.


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