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. Frankenstein vs. Baragon was theatrically released in Japan on August 8, 1965, followed by a theatrical release in the United States on July 8, 1966 by American International Pictures as Frankenstein Conquers the World. The film was followed by The War of the Gargantuas, released on July 31, 1966. Plot During World War II in Nazi Germany, Nazi officers confiscate the living heart of the Frankenstein Monster from Dr. Riesendorf and pass it on to the Imperial Japanese Navy, who take it to a research facility in Hiroshima for further experimentation. As the experiments begin, Hiroshima is bombed with a nuclear weapon by the Americans. Fifteen years later, a feral boy runs rampant in the streets of Hiroshima, catching and devouring small animals. This comes to the attention of American scientist Dr. James Bowen and his assistants Drs. Sueko Togami and Ken'ichiro Kawaji. A year later, they find the boy hiding in a cave on a beach, cornered by outraged villagers. Bowen and his team take care of the boy and discover that he is building a strong resistance to radiation. The former Imperial Navy officer Kawai, who brought the heart to Hiroshima's army hospital, is now working in an oil factory in Akita Prefecture, when a sudden earthquake destroys the refinery. Kawai catches a glimpse of a non-human monster within a fissure before it disappears. Meanwhile, Bowen and his team find out that the strange boy is growing in size due to an intake of protein. Afraid of his strength, the scientists lock and chain the boy in a cage and Sueko, who cares for him, feeds him some protein-filled food to sustain him. Bowen is visited by Kawai, who tells him that the boy could have grown from the heart of the Frankenstein Monster, as the boy was seen in Hiroshima more than once before. At Bowen's advice, Kawaji confers with