Celebs You Totally Forgot Guest-Starred on 'Grey's Anatomy'

Tessa Thompson

Season: 2
The Men in Black: International actress played Camille Travis, Richard Webber’s niece. She passes out on the night of her prom, leading her to find out that her ovarian cancer has returned.

Wilmer Valderrama

Season: 12
The That ’70s Show actor played Kyle Diaz, a musician who is diagnosed with multiple sclerosis. He dates resident Stephanie Edwards but later dies from an infection.