Clip: Lillian Luthor Puts Supergirl Between a Metallo and a Hard Place

After breaking out of prison, Metallo and Lillian Luthor are confronted by Supergirl in this newest sneak peek from tonight's "Luthors" episode.

"You can stop me, or you can save them," Lillian says to Supergirl, as Metallo shoots a kryptonite beam at a crane hanging above the innocent civilians on the street below. "Make your choice, Supergirl."

Oh my gosh! Which one will she choose?

LENA IS ARRESTED – After Metallo (guest star Frederick Schmidt) breaks out of prison and frees Lillian Luthor (guest star Brenda Strong), the police blame Lena (guest star Katie McGrath) for his escape and arrest her. Despite overwhelming evidence, Kara (Melissa Benoist) refuses to believe her friend is guilty and fights to clear Lena's name. Flashbacks reveal how Lena came to be a Luthor.

Meanwhile, Alex (Chyler Leigh) and Maggie (Floriana Lima) celebrate their first Valentine's Day together.

Tawnia McKiernan directed the episode written by Robert Rovner and Cindy Lichtman.

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Distributed worldwide by Warner Bros. International Television Distribution, SUPERGIRL is executive produced by Greg Berlanti (Arrow, The Flash), Ali Adler (The New Normal), Andrew Kreisberg (The Flash, Arrow) and Sarah Schechter (Blindspot, The Mysteries of Laura). Supergirl is based on the characters created by Jerry Siegel and Joe Shuster and appearing in DC Comics, by special arrangement with the Jerry Siegel Family.

"Luthors" episode of Supergirl airs tonight at 8 p.m. ET/PT on The CW.