From Super Mario-kunMario, Luigi, and Yoshi encounter Fryguy in volume 8 of Super Mario-kun. He and his minions attempt to cook them in a soup, but Toad and Birdo arrive by breaking through the sky, riding on a whale, which then flattens Fryguy and his minions. Super Paper Mario...
Fry went to make popcorn. He ignores the warning label on the aluminum popcorn pan saying not to cook in a microwave, which he does. The microwave emitted radiation that collided with the wave from the supernova, causing the Planet Express crew to travel back in time...