TV shows may come and go but characters can be replaced. In some cases, a casting change happens before fans even notice there's a difference. Other shows poke fun at the fact that an actor has left the show and they've added a new person in their place. Following season 1 of Riverdale, the CW was forced to recast the role of Reggie Mantle when actor Ross Butler had a conflict with the filming schedule. Charles Melton slipped into the role beginning with season 2. In the case of The O.C.