The War of the Gargantuas is a 1966 kaiju film directed by Ishirō Honda, with special effects by Eiji Tsuburaya. Referred by film historian Stuart Galbraith IV as a "quasi–sequel" to Frankenstein vs. Baragon, the film was a Japanese-American co-production; it was the third and final collaboration between Toho Co., Ltd and Henry G. Saperstein. The film stars Russ Tamblyn, Kumi Mizuno and Kenji Sahara, with Yû Sekida as Sanda and Haruo Nakajima as Gaira. In the film, scientists investigate the sudden appearance of two giant Frankenstein monsters, named Sanda and Gaira, that culminates in a battle in Tokyo.