The President declares marshal law after Supergirl’s double impersonates her in a brutal attack on Washington. While Kara and Lena search Stryker’s Island for clues to Lex’s whereabouts, Alex must defend the city’s aliens from Ben Lockwood’s newfound power trip.

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About

WILLIE GARSON GUEST STARS

Kara (Melissa Benoist) and Lena (Katie McGrath) head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve (guest star Willie Garson), who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly (guest star Azie Tesfai) encourages James (Mehcad Brooks) to talk to someone for his PTSD, and Alex (Chyler Leigh) faces off against Ben Lockwood (Sam Witwer) after he storms the DEO and acquires some powerful weapons to hunt Supergirl.

Antonio Negret directed the episode with story by Rob Wright and teleplay by Lindsay Sturman & Aadrita Mukerji (#418).