34 Actors You Forgot Were on Grey's Anatomy

Episodes: Season 2, episode 6: "Into You Like a Train" and season 3, episode 17: "Some Kind of Miracle"

Remember that episode about the horrific train crash? Keena, who starred on Undeclared and Entourage, is the girl who is impaled with that other guy. She reappears in one of Meredith's visions later.