After the Bowzock, a ruthless — not to mention reckless — gang of interstellar biker thugs, destroy his home planet of Hazard, Dappu visits Earth where he discovers five humans with the ability to harness "Carmagic." With this power, these five heroes can defeat the Bowzock before the band of witless bikers is able to add Earth to its list of wrecked worlds.

When the Cosmic Invading Grand Racing Crew, Hashiriyan intends to expand their territory with Earth being their next target to take over, five genius mechanics join forces with an alien machine named Boondorio Boonderas to create their own supercars and special equipment to defend the planet as the Bakuage Sentai Boonboomger!