There are two accounts explaining how Kenneth Hale became the Gorilla Man. The earliest account suggested that Hale was plagued by nightmares of a Gorilla Man in deepest Africa. Becoming obsessed with finding the Gorilla Man, Hale traveled to Africa where he tracked down the mythic beast and fought it to death. In killing the Gorilla Man, Ken Hale himself was transformed into a new Gorilla Man.
In the true version of the story,he was an adventurer soldier who feared old age and death.He then heard about a gorilla that would grant immortality to those who kill him.When he killed the gorilla,he gained his immortality,but he also became a gorilla,.