MOM reveals Billy's hidden life as Ganthar, destroyer of worlds before he abandoned his old name, form and way of life and joined the Center. She send the gang to trade the captured aliens for Billy unaware that once the aliens reunite they'll be able to call in reinforcements and destroy the earth! The only one who can stop them is Billy but to do that he'll have to become Ganthar again and he might not want to change back.
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