From Evan Peters to Amber Heard, Here Are Some of the Biggest Stars to Appear on "Criminal Minds"

Best known for his portrayal of Luke Skywalker in the universally beloved Star Wars franchise, Hamill played a serial killer, John Curtis, dubbed "The Replicator." Though his character is present throughout the season eight plot line, he appeared only in the final two episodes — "Brothers Hotchner" and "The Replicator." The actor told BuzzFeed in a 2013 interview how his daughter's love for the show translated into his role on "Criminal Minds": "Usually you don't have an arc like this where they set up something over a period of many, many episodes. As soon as I started watching these episodes, I said, 'Oh, I gotta do this!'"