When military experiments go haywire and trigger an atomic bomb, the consequences are of epic proportions. A monster arrives in the midst of the nuclear fallout, and Japan's defenses are helpless against it. Mankind's only savior is an irradiated water goblin from Japanese folklore called the "Death Kappa." The two rival monsters must go head-to-head in the ultimate battle between good and evil!

For 50 years, "Outer Man" has been a cultural icon in Japan, a superhero TV series as ingrained in the national psyche as Ultraman. Generations have grown up watching the heroic Outer Man defend Earth from the monstrous Sylvie Seijin. But the line between fiction and reality blurs when a giant alien, identical to Outer Man, descends upon Tokyo.