Location from Dragon Ball by Akira Toriyama
A tiny sphere at the end of Snake Way — the miniature planet where King Kai trains the dead and where Goku learned the techniques that changed everything.
Comically small but cosmically important. King Kai teaches here with an emphasis on comedy — you have to make him laugh before he teaches you anything. Goku trained here after dying to Raditz, learning Kaioken and Spirit Bomb. The planet was destroyed when Goku teleported self-destructing Cell here, killing King Kai (who is still annoyed about it). A new, even smaller planet was provided. The contrast between its tiny size and the universe-changing techniques taught here is peak Dragon Ball absurdity.
An absurdly small planet — maybe fifty feet in diameter. Green grass, a single tree, a single road that loops around, a small house, and a vintage car that King Kai never drives. A monkey (Bubbles) and a grasshopper (Gregory) are the only other inhabitants. Despite its size, the gravity is ten times Earth's, making it excellent training ground.
Also known as: King Kai's Planet, North Kai's Planet