Past nastification, redundant alien autopsies and time travelling madness are just part of the fun of Futurama's trip back to Roswell 1947. The episode also contains one of Futurama's best Fry moments, when Fry inadvertantly becomes his own grandfather. Leave it to Fry to stumble through the entire ordeal, plummeting the ship through a wormhole, accidentally murdering his supposed grandfather and knocking his own grandmother up, never once anticipating the causality of his actions.
