Also terry o’quinn plays 3 different characters across 2 episodes and the first movie. Also check out season 3 episode 20 for Charles Nelson Riley, Alex trebec, and Jessie Ventura. Adam Baldwin (firefly) plays a recurring character in the later seasons. And Lucy Lawless (Xena) plays a character in a 2 episode story arc. There’s so many more I’m leaving out, but the x files is worth a watch (or re-watch)!