Just to follow up, I'd like to say that Rifftrax has only PROFESSIONALLY riffed 3 Star Trek movies. Meaning that Mike Nelson and or Kevin Murphy and Bill Corbett have written and performed the riffs. The movies they did Were Star Treks V,VI, and Generations. Kevin Murphy and Bill Corbett (also MST3K alum) riffed Star Trek: New Voyages episodes To Serve All My Days and World Enough and Time. The riffing of TMP, TWOK, and Caretaker are FAN riffs that are featured on the Rifftrax website and are written and performed by amateurs. Some of the samples I've seen of the fan content aren't bad, but it doesn't stand up to the work of the pros.