Threw me for a loop when I first heard it. Had to stop watching and verify. Sure enough, Piglet was one of the temporary vessels of the alien that was once Jack The Ripper.

Side note: the "demon voice" used when it inhabited the ship's computer absolutely must be the inspiration for the one used in the Evil Dead series.

Same here ... we watched the episode last year and I like looking up the actors and any trivia in an episode we watch. We both knew the voice ... then when I looked up the actor, it was amazing to find out it was Piglet! We couldn't watch the rest of the episode without saying something about it.