The villainous Gigatron has brought his Destronger forces to Earth, aiming to plunder the planet's abundant energy resources to power their war against the Autobots. Should they succeed, the Destrongers will finally shift the balance of power in their favor, wiping out the Autobots and proceeding to conquer the universe. For this purpose, the Destrongers have abducted Dr. Ohnishi, Earth's foremost expert on energy and natural resources. Dr. Oonishi's son, Koji, is approached by none other than Fire Convoy, who recruits the boy for a mission to save his father. Despite the valiant efforts of Fire Convoy and the other Autobots, they fail to rescue the doctor from the Destrongers. Now, the task falls to the Autobots and Koji to free Dr. Oonishi and defend Earth and its resources from Gigatron and his army.