The Alcorak was destroyed by Vega's forces. Grendizer's mission is to travel to the four corners of the planet to find each piece of debris from the device in order to be able to reconstruct it. During his journey, Goldorak will have to face many enemies. At the end of each level, a part of the Alcorak will be won. When all the parts of the Alcorak have been assembled, it will then be possible to start the game again on board.