The Sazer-X team find a mysterious boy who claims to have amnesia, meanwhile, an ancient evil has awakened and begins consuming the people of earth. Bosquito, an extremely powerful evil being from ancient times has absorbed the power of the Justirisers and is using it to fuel its own minions. Sazer-X, the Justirisers, and the Gransazers must work together to defeat this villain and save the planet.