The creation of the Black Hole Planet 3 Aliens, Mechagodzilla was the centerpiece in their planned invasion of Earth. The magnificent machine was released from the crater of Mount Fuji wearing a Godzilla disguise, and made its way to Tokyo after dispatching Anguirus. Once it reached Tokyo, the impostor was attacked by the real Godzilla, who quickly revealed its true colors. Mechagodzilla was damaged in the ensuing fight with Godzilla, but was repaired and sent to destroy King Caesar at Okinawa. Godzilla returned and aided King Caesar, and together they were able to destroy Mechagodzilla. A year later, Mechagodzilla was rebuilt by the Black Hole Planet 3 Aliens and re-christened Mechagodzilla 2 and was unleashed on Tokyo once again, this time aided by the monster Titanosaurus, which was controlled by the deranged human scientist Dr. Shinzo Mafune. Godzilla rose to battle his robotic doppelganger a second time, but found himself badly outmatched against two foes. However, with the aid of humanity and the sacrifice of Katsura Mafune, Dr. Mafune's cyborg daughter, Godzilla was able to triumph once again.