15 Best Futurama Episodes

Before this particular episode aired, it had already been revealed that Nibbler was not just Leela's silent pet, but a very intelligent alien older than the universe itself, whose sole purpose is to keep the world safe from seemingly unstoppable outside threats.

In The Why of Fry, Nibbler's backstory is given a lot more depth, as it's revealed that he's the one who made Fry fall into the cryogenic chamber 1000 years earlier, so Fry could come to the future as the only person who can save the universe from impending doom.

It's a shocking revelation that could easily have jumped the shark, but in fact does wonders to add compelling levels to Fry's place in the world and Nibbler's long history as an intergalactic hero working in the shadows to keep everyone safe.

Funny, sweet and an expert slice of worldbuilding, it's pure bliss front to back.