Tucked away in his castle, a hypochondriac inventor plays generous host to a revolving cast of wacky guests. But to pay off his mounting debts, he must sell either a powerful businessman or a rich gypsy on his latest creation: a laser skywriter.

Aiming to defeat the Man of Steel, wealthy executive Ross Webster hires bumbling but brilliant Gus Gorman to develop synthetic kryptonite, which yields some unexpected psychological effects. Between rekindling romance with his high school sweetheart and saving himself, Superman must contend with a powerful supercomputer.