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Captain Flash must stop the Black Knight from obtaining a new guided missile that has been developed. When the Black Knight and his men attempt to steal the missile, Captain Flash intervenes, but the villain escapes. Flash pursues the Black Knight, who has kidnapped Professor Keith Spencer and Ricky aboard a speeding train. During the confrontation, Professor Spencer creates a small atomic explosion that transforms him into the Invincible, and Captain Flash manages to save the train passengers as the Black Knight flees.