The Kaio-Ken was first taught to Goku by King Kai in the other world. The move gives Goku a direct boost to power, speed, and ki at the cost of intense strain on the body. If he overuses the Kaio-Ken, ...

Goku’s early design was more monkey than Saiyan; see how Toriyama’s original sketches nearly changed ‘Dragon Ball’ forever.

When Dragon Ball Super returns, the iconic Goku-Vegeta fusions could become a permanent staple of the series in future arcs.