The War of the Gargantuas is a Japanese kaiju film released in 1966, directed by Ishiro Honda and produced by Toho Studios. The film is a sequel to the earlier film Frankenstein Conquers the World and follows the story of two Gargantuas, Gaira and Sanda.
Gaira is a savage humanoid sea-beast created from the cells of Frankenstein's monster, who emerges from the ocean and begins attacking Tokyo and its citizens, in an attempt to feed on them. The Japanese military launches an attack against Gaira but proves futile, as the creature is immune to conventional weapons.
To make matters worse, Sanda, Gaira's brother, arrives on the scene to defend him. Unlike Gaira, Sanda is a benign creature living in the forests of Japan. However, the military mistakes him for Gaira and attacks him as well. After realizing their mistake, the military teams up with Sanda to find a way to stop Gaira's rampage.
The film features intense action sequences and special effects, showcasing the titanic battles between the Gargantuas and the military. Ultimately, it is revealed that Gaira is a malevolent creature intent on destruction, while Sanda is a righteous being fighting to protect humanity. The climax sees the two brothers engaged in a fierce battle, which leads to a devastating end and leaves the city of Tokyo in shambles.
The film received positive reviews for its imaginative storyline and outstanding special effects and has since become a cult classic. The War of the Gargantuas is among the most popular kaiju movies to have emerged from Japan during the 1960s and 70s and is still enjoyed by genre fans worldwide.