The synthetic kryptonite Gus Gorman gives to Superman induces the same unpredictable effects as red kryptonite does in the comics.The sequence where the kryptonite causes Superman to split into two separate beings - one Superman, the other Clark - is adapted from 'The Splitting of Superboy' (Adventure Comics #255, December 1958). In both stories Superman is exposed to kryptonite radiation that has the strange effect of dividing him into two. In the comic it is the Clark doppelganger that is evil, while in the movie it is the Superman version.In both stories the good and evil versions end up fighting each other in a junkyard. Red kryptonite caused Superman to split into two people a second time in 'The Feud Between Superman and Clark Kent!' (Action Comics #293, October 1962). This time is was the adult Superman that was afflicted. The Clark Kent version is the good half in this story, while the Superman version is bad.The bad Superman displays an increased libido. His misguided super-activities have a negative impact on the people of Earth.Interestingly, this story also features a scene where the bad Superman tries to impress Lois by making the Earth spin faster. This has the effect of making time pass more quickly. A possible influence on the time reversal scene from the first film?There are several other issues where red kryptonite splits Superman and Clark into two different people. Usually the Superman version is the bad one, and typically he ends up fighting the good/Clark side of his personality before the two of them finally remerge. So this is one aspect of the movie that has many precedents in the comics.

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