Johnny, along with Lonny and Donny, was one of three giants who came to the Mundane world with the other Fables after fleeing the Adversary. Thinking that they were too dangerous (and much too noticeable) to leave walking around, the leadership of Fabletown decided to put a spell on the giants and the dragon in order to make them slumber eternally.
However, when there was an uprising on the Farm, Snow White sought to wake them, in order to gain control back from the militia. In the aftermath of the battle, the Three Little Pigs were no more and someone was needed to fill their role. Rose Red authorized for the three giants to be permanently transformed into the new three little pigs and the dragon to be changed into a raven, Clara, who became Rose's new enforcer.