Episode 45 of "Futurama"
s04e01 Roswell That Ends Well
Title: Roswell That Ends Well
Original Air Date: 12/09/2001 on Fox
Director: Rich Moore
Writer: J. Stewart Burns
Plot Outline:
During a supernova explosion, Fry uses the Planet Express's microwave oven, and the two forces collide, they are sent back to 1947. They crash in the desert outside of Roswell, and Dr. Zoidberg and Bender's headless body are imprisoned and taken to a military base, where Fry's grandfather is stationed. The Professor and Leela work on how to return to 3002, while Fry and Bender's head try a rescue at the base and make a contact that might put Fry's own existence at risk.