Seeing the United States and the Soviet Union engaged in a nuclear arms race that could lead to Earth's destruction, Superman decides that he must take action. He collects all the nuclear warheads from the world and throws them into space. Meanwhile, Superman's nemesis, Lex Luthor, has broken out of prison with a new scheme. He clones Superman with radioactive material to create Nuclear Man, a being just as powerful as the man of steel.

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