Fan Casting Superman III

In this third installment, a computer genius named Gus Gorman is brought into the employ of Ross Webster, who has designs on ruling the world. However, all of his schemes are thwarted by Superman. Webster then orders Gorman to use his computer knowledge to create synthetic Kryptonite after remembering a Daily Planet story about the last original chunk disappearing years earlier after falling to Earth. (Whether Webster is referring to the Kryptonite robbery in Superman is unclear.) After scanning the coordinates of Krypton's former location via satellite, the results show a small percentage of an unknown component. The substitution of tar (which Gorman used after glancing at a cigarette carton) for a crucial, but unknown, component resulted in the synthetic kryptonite behaving like Red and Black Kryptonite: in this case, turning Superman evil and eventually split him into two people.