The War of the Gargantuas, released in Japan as Frankenstein's Monsters: Sanda versus Gaira (フランケンシュタインの怪獣 サンダ対ガイラ, Furankenshutain no Kaijū: Sanda tai Gaira), is a 1966 Kaiju film, sequel to Frankenstein Conquers the World.
It introduces two giant, hairy humanoids 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 Gaira (ガイラ, from kai, "sea"). The Brown Gargantua had been raised in captivity, and is docile and gentle; because he resides in the Japan Alps, he is called Sanda (サンダ, from san, "mountain"). The film follows the investigation and military engagements of these creatures until their climactic 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
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