Son Goku is the Monkey King that was banished from Heaven and locked away in a rock prison for the crimes he committed. He was found by his surrogate father Genjou Sanzou after he appeared at his prison due to Goku "calling out to him". He has been with Genjou ever since, and is currently one of the three companions that travel with Genjyo in order to stop the Gyoumaou resurrection.