VIDEO: Sneak Peek - 'For Good' Episode of SUPERGIRL on The CW

On the next episode of SUPERGIRL titled 'For Good', someone tries to kill Morgan Edge (guest star Adrian Pasdar) and he barely survives. He accuses Lena (Katie McGrath) of being behind the attempt and vows to destroy her. When Lena fears her hatred for Morgan will take her to the Luthor dark side, Kara (Melissa Benoist) steps in to help her friend. Meanwhile, after Sam (Odette Annable) realizes she's losing time, she confides in Alex (Chyler Leigh) who decides to run some medical tests to see if she can find out what's going on with her new friend. SUPERGIRL airs Mondays at 8/7c on The CW, and available next day on The CW App. Get a sneak peek below!

About SUPERGIRL: SUPERGIRL is based on the DC character Kara Zor-El, Superman's cousin, who after 12 years of keeping her powers a secret on Earth, decides to finally embrace her SUPERHUMAN abilities and be the hero she was always meant to be. Kara lives in National City assisting media mogul Cat Grant.

However, Kara's days of keeping her talents a secret are over when Hank Henshaw, head of a super-secret agency, enlists her to help protect the citizens of National City from sinister threats.