Futurama
Roswell That Ends Well
Season 4 Episode 1 – first aired on Dec. 9, 2001
The combined explosions of a supernova and Fry putting metal in the microwave hurtle the Planet Express crew back in time to 1947. They land at Roswell, New Mexico, where a shattered Bender is mistaken for UFO debris, Zoidberg is taken in for an alien autopsy, and Fry accidentally kills his grandfather, Enis, in a nuclear explosion.
Quotes:
Professor Farnsworth: For example, if you killed your grandfather, you'd cease to exist!
Fry: But existing is basically all I do!
We're in the middle of nowhere, which is the safest part of nowhere.