'Star Wars' actor Mark Hamill landed a guest starring gig on CBS' serial killer show. According to TV Guide, Hamill will appear on the two-part season finale.
Details about Hamill's role are being kept under wraps, but could he be the BAU's season-long unsub/stalker The Replicator? In the two-hour episode, the team's pursuit of The Replicator will come to a head when one of them becomes a victim.
'Criminal Minds' season 8 two-part finale airs on Wednesday, May 22 on CBS.