Scientists have developed a weapon, called the "Super H-bomb", which if detonated will wipe out the human race entirely. A "High Tribunal" in "The Great Court of Outer Space" is called upon to decide whether divine intervention should be allowed to stop the bomb's detonation. The devil (Vincent Price), who goes by the name of Old Scratch, prosecutes Mankind while the Spirit of Man (Ronald Colman) defends it.