Superman's mission to rid Earth of nuclear weapons runs afoul of Lex Luthor and the radiation-spawned Nuclear Man.
"What Could Have been", Part One, explored what might have happened if Bryan Singer had stayed on to direct X-Men: The Last Stand instead of leaving for Superman Returns. Singer's Superman was supposed to bring the beloved franchise back to the former glory it had achieved with Richard Donner's Superman and Superman II (the "Director's Cut," of course). Superman 5 is the subject of Part Two of "What Could Have Been," an unproduced sequel that would have brought Christopher Reeve back for one last turn as the Man of Steel.
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