When the Earth is threatened by alien invaders and giant monsters, the world relies on the Science Patrol, a special anti-monster defense agency armed with high-tech weaponry and vehicles to combat these threats from the unknown. When the Science Patrol's weaponry is ineffective and all hope is lost, one of their members, Shin Hayata, transforms into a giant alien called Ultraman to defeat the monstrous menace threatening the Earth, unbeknownst to the other Science Patrol members, who are unaware of his secret identity.