Return to the Nest

Someone on a garbage planet picked up a half-dead idiot with a damaged body. The idiot did nothing but stare into space, grin stupidly, and look up at the sky every day, while everyone else bullied him. One day, the others shoved a piece of mutated food at the idiot and forced him to eat it. Then the idiot woke up. "Take me back, or I'll kill you." The garbage planet is rife with deadly radiation, mutated creatures, and sources of infectious disease. The mutated lifeforms everyone fears and avoids are the only food that can keep him conscious and sane. "I want to go back." "Back where?" He pointed at the sky. "What are you going back for?" He said, "To destroy everything." Premise: A seed that breaks free of the garden's confines grows wild and free in the open world