The Human Vapor is a 1960 Japanese science fiction film directed by Ishirō Honda, with special effects by Eiji Tsuburaya. Produced and distributed by Toho Co., Ltd., it is the third and final film in the Transforming Human Series. In the film, a scientific experiment goes awry and turns its subject into an unstoppable gaseous mutant who takes advantage of his abilities and commits ruthless crimes.

Frankenstein vs. Baragon is a 1965 kaiju film directed by Ishirō Honda, with special effects by Eiji Tsuburaya. The film stars Nick Adams, Kumi Mizuno and Tadao Takashima, with Koji Furuhata as Frankenstein and Haruo Nakajima as Baragon. An international co-production of Japan and the United States; it was the first collaboration between Toho Co., Ltd and Henry G. Saperstein. In the film, scientists investigate the origins of a mysterious boy and his resistance to radiation that makes him grow to monstrous size, while a second monster ravages the countryside.