When he and Mechagodzilla left the hangar, he was immediately faced with Hedorah. After dodging one of Hedorah's attacks, Harrison 'regained' his ability to speak, through Mechagodzilla. He then taunts Hedorah and prepares to fight it, however Hedorah's sludge smacks Mechagodzilla directly. As Mechagodzilla's defenses started to fail, Godzilla suddenly appeared and started to fight Hedorah. Back on Monster Island, Hikari managed to find a way to distract the men in charge, Fletcher and Everett, using love pheromones. Boxer took the opportunity to destroy one of the generators that were keeping the field on and caused it to dissipate, allowing Anguirus, Battra and Titanosaurus to walk free. Boxer met Hikari at the building when Kumonga walked onto the building top with them. Boxer wondered how they were going to be able to transport it back to the mainland, Hikari instead asking how they were going to stop it from killing them. Just then however, Harrison arrived with Mechagodzilla. Boxer and Hikari got inside the mech, put Kumonga on its back and started flying back.
Earth's monsters went to fight their extraterrestrial enemies. Anguirus met with Rodan in Hong Kong to fight Gigan, Battra and Titanosaurus arrived in London to battle SpaceGodzilla and Godzilla was fending off Hedorah.
"Earth is ravaged by the Space Monsters! With Earth's kaiju trapped on Monster Island, the planet is seemingly doomed. Until Boxer decides to undo all of his hard work and stage the biggest prison break of all time!"