Toho's official name for the creature is simply "Giant Octopus", as shown in promotional material for Godzilla: Tokyo S.O.S.. Oodako is a fanmade nickname which translates to giant octopus, like Ootokage for the giant lizard and Ookondoru for the giant condor.
In King Kong vs. Godzilla, Oodako crawls ashore on Farou Island and attacks a village hut in an attempt to get the special soma berry juice that the natives store there. The natives, along with members of a pharmaceutical company, attempt to defeat Oodako with spears and shotguns, but to no avail. King Kong then appears behind a giant wooden fence, crumbling it with his bare hands and throwing the pieces at Oodako. Kong grabs Oodako, but the octopus holds tightly on to Kong's head. After a short struggle, Kong pulls the monster off and throws it to the ground. He then throws two boulders at Oodako's head. Oodako flees back to the beach and presumably returned to the sea, Kong beating his chest and roaring in victory.
In the alternate ending for Frankenstein Conquers the World, after Frankenstein defeats Baragon, Oodako comes from the sea and fights Frankenstein. Frankenstein battles fiercely, but can't compete with Oodako's numerous and powerful tentacles. Oodako drags Frankenstein in to the water, seemingly to his death.
- The inclusion of Oodako in Toho's vast slate of monsters may be the fulfillment of a dream of special effects director Eiji Tsuburaya, who had always wished to make a monster film with a giant octopus (original concept art for Godzilla himself for the 1954 film depicted him as a giant octopus).
- For the Oodako scene in King Kong vs. Godzilla, four live octopuses were used. They were forced to move among the miniature huts by having hot air blown onto them. After the filming of that scene was finished, three of the four were released. The fourth became special effects director Eiji Tsuburaya's dinner. Along with the live animals, two rubber octopus props were built, with the larger one being covered with plastic wrap to simulate mucus. Some stop motion tentacles were also created for the scene where the octopus grabs a native and tosses him.
- Each monster that Oodako fought with was of primate origin.
- Oodako is one of the four minor Showa era monsters, who include the Giant Lizard, Skeleturtle, the Giant Condor, the Giant Sea Serpent, and Oodako, to have received one or more official toys. The others are Skeleturtle, the Giant Condor and the Giant Sea Serpent.
- The M.U.T.O. Research website accepts "Oodako" as the Giant Octopus' official name.
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