The War of the Gargantuas, released in Japan as , is a 1966 daikaiju eiga (giant monster movie), and a semisequel to Frankenstein vs. Baragon.
It introduces two giant, hairy humanoid called Gargantuas, which spawned from the discarded cells of Frankenstein's monster from the previous film and are described as brothers. The Green Gargantua is violent and savage, preying upon human beings; as he lives in sea water, he is given the name . The Brown Gargantua had been raised in captivity, and is docile and gentle; because he resides in the Japan Alps, he is called . The film follows the investigation and military engagements of these creatures until their climatic confrontation in Tokyo.
Several ambiguous references are made to Frankenstein vs. Baragon, such as the mention of a severed hand, but the only direct link between the films is the term "Frankenstein", which appears in the title and is used to refer to the Gargantuas ("Frankensteins") in the original Japanese dialogue. Like the previous film, which starred Nick Adams, War of the Gargantuas features a Hollywood actor (Russ Tamblyn) in the lead as a scientist, Kumi Mizuno as his colleague, and another Japanese scientist (previously Tadao Takashima, here Kenji Sahara). The similar casting has led to speculation that the film was intended to feature recurring characters. Eiji Tsuburaya helmed the special effects crew with monster suit actor Haruo Nakajima portraying the antagonistic Gaira. (Yū Sekida played Sanda.)
The film itself is rather vague as to where (if at all) The War of the Gargantuas falls in regard to the continuity of Toho's other kaiju films, or even if it should be considered a canonical part of the Godzilla series. In 2002's Godzilla Against Mechagodzilla, however, specific reference to the Gargantuas is made, indicating that (in this variation on Godzilla continuity, in any case) The War of the Gargantuas is considered by Toho to be a legitimate part of the Godzilla universe.
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