Professor Tatsuno, who studies remote control of nuclear bombs, has been kidnapped by an unknown group. Kitami, along with Inspector Yagyu of the , immediately set out to investigate and understood that this was the work of an international criminal-terrorist organization called the World Union Alliance (W.U.A.) led by Hayato Kuroki, a and far right leader with . During the investigation, Kitami discovers the WUA secret hideout and infiltrated it until he was captured by Kuroki's men. Then, the WUA will get the design drawing of the Zeta Line, a remote control device which can detonate any nucleus on Earth, complete the device and plan the detonated on the as a starting experience.