TV Guide at Yahoo! is reporting that Mark Hamill will be guest-starring in the two-part season 8 finale of CBS’ procedural drama Criminal Minds. While there’s no word yet on exactly who Hamill will play, TV Guide speculates that he may be following more in the footsteps of the Joker than Luke Skywalker:

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. Executive producer Erica Messer also previously told TVGuide.com that the BAU won’t come face-to-face with The Replicator until the season’s final two episodes.

The Criminal Minds two-part season finale airs May 22nd, 9e/8c.