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Octogon (オクトゴン Okutogon) is antagonist from the movie Doraemon: Nobita's Great Adventure in the Antarctic Kachi Kochi. It is an octopus.
- Both Octogon and Yamitem were revealed in a issue of CoroCoro comics that is published in December 2016.
- Its name is similar to bosses' name from The Legend of Zelda: Oracle of Ages