Andrew J. West (born November 22, 1983) is an American actor who is best known for his roles as Fisher in Greek and Gareth in The Walking Dead. He appeared as a guest star in the fourth-season finale, and was promoted to a series regular for the fifth season. His performance earned him a Saturn Award for Best Guest Starring Role on Television nomination. He also portrayed the adult Henry Mills on the final season of Once Upon a Time. (Via Wikipedia)