"Superman III" is a 1983 superhero film that follows Clark Kent as he faces a new threat in the form of Gus Gorman, a computer genius who uses his skills to create chaos. Gus accidentally unleashes a synthetic kryptonite that turns Superman evil, leading to a battle between the hero and his darker self. In the film, Lois Lane is absent, and Clark rekindles a romance with Lana Lang, a character from his past. The movie combines action and comedy, featuring a memorable scene where Superman battles a giant robot. Ultimately, Clark must overcome his inner demons to save the day.