Jason Jr. was the "child of the pain father" or "son of the slaughterer" who owns two pet doom hounds. He was ordered by his father to enslave all of humanity along with his sidekick. His father told him to do so a couple hundred years ago but Jason Jr. refused. Grandpa Lemon then explained that the Earth was standing still, and humans would soon be wiped out, and Jason knew that he would receive punishment if he didn't enslave Earth before humanity was wiped off of it. Jason let them borrow the Unholy Crown of the Earth Serpent so that they could use it as a drill. When they returned, Nerville gave him a Z-Orb game console, which he knew would distract Jason Jr. from enslaving humanity for a couple more centuries.
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