Fury At 5000 Fathoms! Captain Barracuda fires the gamma machine into the Hulk. The green behemoth drops unconscious. Barracuda brings Crusoe and the gamma machine into his submarine. Hulk recovers and follows them under water. When they reach an underwater city, Hulk witnesses how Crusoe is turned into an ape man with the gamma machine. The ape Crusoe is put in a cell. Hulk frees Crusoe and fights the villains. Barracuda knocks out the Hulk with the gamma device which triggers the transformation. Crusoe kills Barracuda and turns everyone into apes using the machine. Finally, Robinson puts Bruce in a small submarine that launches to the surface while he blows up the underwater city to history.