Late at night, a Japanese fishing boat was viscously attacked by a giant octopus. A giant fuzzy green monster puts up a fight with the octopus and eventually wins. But only to claim the people on the ship. He sinks the ship and catches those who tried to flee. He ate them, not noticing the surviving fisherman who is rescued by JSDF. He told them the story but they thought that he was lying. Just then, the green monster emerges again and attacks an airport eating a woman. The sun came out scaring him back into the ocean. JSDF are convinced that his story is true and turn to Dr. Stewart for help. Dr. Stewart captured a creature like him but smaller. This creature was brown, he escaped and reache dhis full size living in the mountains. JSDF planned on ambushing the green Gargantua with their new masers. The plan works as they almost kill the creature. But the brown Gargantua came to his aid and brings him back into the forest. He did this because it was his brother. However, the green Gargantua's eating habit angered th brown Gargantua into violence. The two monster sbattled eachother until they got to down town Tokyo were the two plunged into the ocean and were swallowed by a volcano that erupted by millitary weapons.
|Japanese Title:||Frankenstein's Monsters: Sanda vs. Gaira|
|US Title:||War of the Gargantuas|
|Japanese Release Date:||July 31st, 1966|
|US Release Date:||July 29th, 1970|
|Running Time:||90 minutes|