Had Richard Donner completed the Superman sequel back in 1979, it very likely would have been a better film than what Lester ultimately made but 2006's The Donner Cut is simply the best one could do 26 years later. It's also a bit jarring to see test footage in the middle of a movie.
Computer programmer Gus Gorman (Richard Pryor) is hired by financial tycoon Ross Webster (Robert Vaughn) to seize control of a weather satellite and annihilate Colombia's coffee crop. When Superman (Christopher Reeve) manages to thwart the plan, Webster commands Gorman to use the satellite to locate kryptonite, the Man of Steel's mortal weakness. But a missing unknown element in the kryptonite replaced by Gorman with tar causes an unintended side effect when presented to Superman.
