A Grey's Anatomy Fan-Favorite Just Joined Supergirl…as a Doctor!

From the halls of Seattle Grace Hospital to DC comics lore, Chyler Leigh just can't get enough of playing a doctor on TV shows!

After her fan-favorite character Lexie Greyhalf-sister to Meredith Grey (Ellen Pompeo)tragically died during the heartbreaking plan crash storyline on Grey's Anatomy at the end of season eight (we're still not over it), she hung up her white lab coat for a few years. But now she's dusting off her scrubs once more...and this time, it's for a comic book show!

E! News has learned that Leigh has just joined CBS and Warner Bros. new Supergirl TV show in a series regular role.

MORE: Why we can't wait for Supergirl

So who will the Grey's Anatomy alum play?

Leigh will take on the role of Alexandra "Alex" Danvers, the confident foster sister of Kara (series star Melissa Benoist). Fascinated by Kara's powers from a young age, Alex developed a lifelong obsession with science which inspired her to become a doctor.

And lucky for Leigh, she's already got seasons and seasons of practice playing a doctor!

E! News has also learned thatHomelandandSelfiealumDavid Harewoodhas also landed a series regular role on the new DC comics show...and his role is actually a huge Easter Egg for fans of the comics!

Harwood will star as Hank Henshaw, a onetime CIA agent who now runs the Department of Extra-Normal Operations (DEO), which tracks extraterrestrial threats on the planet Earth. For those not well-versed in DC comics history, Hank Henshaw is famous in the comics for being Cyborg Superman.

Harewood and Leigh join previously cast Ally McBeal and Brothers & Sisters' alum Calista Flockhart in her return to TV as Cat Grant, Kara's boss, True Blood alum Mehcad Brooks as James "Jimmy" Olsen, a photographer at CatCo, while Tony Award winnerLaura Benanti, Nashville, Go On and The Good Wife alum, is taking on the recurring role of Kara's birth mother,Alura Zor-El.

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A Grey's Anatomy Fan-Favorite Just Joined Supergirl...as a Doctor!