VIDEO: The CW Shares 'Supergirl' Teaser From Upcoming Elseworlds Crossover

Elseworlds, the 3-night crossover event, begins Sunday, December 9 on The CW! Stream free only on The CW App.

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.

The CW Television Network features the hit series Riverdale, as well as Black Lightning, The Flash, Arrow, Supergirl, DC's Legends of Tomorrow, Supernatural, Jane The Virgin, Crazy Ex-Girlfriend, The 100, iZombie, Dynasty.