MEGAWEAPON OWN3D
When I first saw this back in High School it was the first MST3k i sent a fan letter too, complete with a picture of MEGAWEAPON crushing Einstein with Joel and the gang cheering him on. I don't think it ever got shown on the air, but I spent a while working on it.
I'm a sucker for post-apocalypse movies like this. And I really believe Worth had a good idea originally. But as he said in his interview on the MST3k dvd it didn't have time to evolve. Part of me would like to see a remake of this movie, but another is proud of this version for the hilarity it created.
Overall it's one of my favorite MST3K riffs.