Aiming to defeat the Man of Steel (Christopher Reeve), wealthy executive Ross Webster (Robert Vaughn) hires bumbling but brilliant Gus Gorman (Richard Pryor) to develop synthetic kryptonite, which yields some unexpected psychological effects in the third installment of the 1980s Superman franchise. Between rekindling romance with his high school sweetheart (Annette O'Toole) and saving himself, Superman must contend with a powerful supercomputer.

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