Oodako was a giant octopus that lived near the shore of Faro Island, home of King Kong. Oodako's diet consisted of the special red berries, which were believed to make him big. Oodako, one time, attacked the village on Faro Island in search of the red berries. The villager's god though, King Kong, came to the rescue to fight Oodako. Oodako retreated to the sea and was never seen again in the movie and the Godzilla series.

Little is known about Oodako. He is the only monster in the whole Godzilla series that did not confront Godzilla. King Kong vs. Godzilla was not Oodako's only appearance though. He later appeared the two Toho "kaiju" movies Frankenstein vs. Baragon and War of the Gargantuas. In Frankenstein vs. Baragon, he fought and defeated both Baragon and Frankenstein, and in War of Gargantuas, he fought and was defeated by the green Gargantua, Gaila.