A big earthquake suddenly happens in New Joke. But the inhabitants are not the only ones who are shocked - so is Gel Sadra. She never gave this order! This operation has been undertaken by the Galactor commander Panther. He convinces Gel Sadra to participate in the operation, thus showing Governor X her strength. The Science Ninja Team goes to investigate and detects a missile base in a huge underground, public hall. Galactor has shot a missile into a gas chamber and thus created the earthquake. At that moment, the missile that Joe, Jun and Ryu discovered is launched, causing another earthquake. It also causes the hall to collapse and Joe, Jun and Jinpei are locked in. Under Nambu's order, Ken and Jinpei leave for Rodo Island to stop the guidance waves of the missiles, even if they don't like leaving their comrades behind. But the attacked Galactor base rises into the sky! The base is the huge mecha Mechasatan.