Flying saucers with speeds exceeding 1,600 kilometers per hour frequently appear over the earth, and at the same time a strange disease is spreading on the earth. The human scientist Dr. Asayama (played by Masao Takamatsu) discovered the secret, which caused panic and kept silent. The strange star from the far side of the moon intends to hijack the doctor, and is rescued by the steel giant, the justice messenger on the planet Emrad