Ultraman, an alien giant of light, rescued the Earth fifty years ago but then vanished. Shin Hayata, Ultraman's human host, was left with no recollection of his time as a hero. Shinjirou, Hayata's little kid, is discovered to have been born with a more robust and durable physique than any normal person. The SSSP, the group that helped Ultraman, discloses Hayata's background to him. His father then dons a power suit once more, resuming the role of Ultraman.