Where you've seen him before: West tormented Rick & Co. as Terminus leader Gareth on The Walking Dead. He also recurred on Greek and Dead of Summer, the short-lived Freeform horror drama from Once Upon a Time creators Edward Kitsis and Adam Horowitz.
Who he plays: Adult Henry Mills. Henry is all grown up now and living in the new setting of Hyperion Heights when a girl named Lucy appeared at his front door in the Season 6 finale claiming to be his daughter -- a callback to Emma and young Henry's interaction in the pilot. Lucy is Henry's daughter, with Cinderella/Jacinda, but the family was separated by a curse, and he has no memory of her.