Jetter of the 30th century time patrol, while chasing the criminal known as Jaguar, was accidentally transported to the 20th century. And because of a malfunction in the time machine called Ryuuseigou, Jetter is unable to return to his own time. At the request of Director Saigou, head of an international criminal investigation organization, Jetter decides to protect the peace in the 20th century by helping in criminal investigation. Meanwhile, Jaguar is also transported to the same time period via a time machine malfunction, and so the 20th century world makes contact with a nefarious villain...