What would Star Trek V have been like if Leonard Nimoy had played both Spock and his misguided brother Sybok? Answer: Probably still pretty terrible, all other things being equal.

The real Mystery Science Theater 3000 could never afford to tackle big-budget disasters like Star Trek V, but that didn't stop an intrepid group of fans. The fan MST3K of The Final Frontier is a thing of beauty.

Now that we're already discussing Iron Man 3, and filming may soon start on the Superman Returns sequel, it's a good time to look at science fiction's wreckage-strewn history of bad and weird sequels. From the crazy dancing in The Matrix: Reloaded to the crazy dancing in Spider-Man 3, few genres have created as many…