Homer Simpson IS Radioactive Man! At least, that's what he thinks after contracting a nasty case of amnesia en route to a costume party. This fusion delusion leads to confusion and forced seclusion in Springfield's foremost mental institution! And as Marge takes over Homer's post at the plant, Radioactive Homer finds his Fallout Boy in the guise of Leon-the guy who thought he was Michael Jackson! But when the core is thrown into chaos and Marge well-being hangs in the balance, guess which Nuclear Knight comes to save her from a nuclear nightmare?