Superman III (1983) on Netflix

In mortal enemies, the Man of Steel has no match. Even faced with a trio of sinister super-powered villains from his home planet, Superman saved the day. But can super-strength stand up to the diabolical circuitry of a criminally insane computer? Enter Gus Gorman, a genial half-wit who just happens to be a natural-born genius at computer programming. In his hands, a computer keyboard turns into a deadly weapon . . . and soon, Superman faces the microelectronic menace of his career. Clark Kent meets his old flame Lana Lang at a Smallville High School reunion and Superman turns into his own worst enemy after exposure to a chunk of red kryptonite.