After Rhea pits Kara against Superman himself, she takes the only option she can see: challenging the alien queen to single combat to save the planet. When the Luthers offer a deadly back-up plan, Supergirl faces the possibility that her future with Mon-El may be the price of saving her world.

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

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SUPERGIRL FIGHTS FOR HER CITY; SUPERMAN RETURNS

Supergirl (Melissa Benoist) challenges Rhea (guest star Teri Hatcher) to battle to save National City. Meanwhile, Superman (guest star Tyler Hoechlin) returns and Cat Grant (guest star Calista Flockhart) offers Supergirl some sage advice.

Glen Winter directed the episode with story by Andrew Kreisberg & Jessica Queller and teleplay by Robert Rovner & Caitlin Parrish (#222).