Seiji Onaka (大仲 清治 was a Japanese professional baseball player and actor. He appeared in numerous small roles in many of Ōnaka Seiji)Toho's science-fiction films from 1956 to 1970. He was also cast as Godzilla in Son of Godzilla due to his tall stature, but a hand injury forced him to bow out of the role shortly after filming started and was replaced by Hiroshi Sekita. He passed away sometime prior to 2016.
- Rodan (1956) as Nakagawa
- The Human Vapor (1960) as Police officer
- King Kong vs. Godzilla (1962) as Pacific Pharmaceutical employee / Oyanamaru sailor [uncredited]
- Mothra vs. Godzilla (1964) as Fisherman / police officer [uncredited]
- Dogora (1964) as Airplane passenger [uncredited]
- Ghidorah, the Three-Headed Monster (1964) as UFO club member / reporter / tourist [uncredited]
- Frankenstein vs. Baragon (1965) Passenger on ferryboat / SDF soldier [uncredited]
- Invasion of Astro-Monster (1965) as JSDF soldier [uncredited]
- The War of the Gargantuas (1966) as Coast Guard official [uncredited]
- Kaiju Booska (TV 1966-1967) as Human Kong [episode 11] / Sumitomo Fujiwara's subordinate [episodes 33-34]
- Ebirah, Horror of the Deep (1966) as Newspaperman / dance spectator / Red Bamboo soldier [uncredited]
- King Kong Escapes (1967) as Sailor on Dr. Who's ship [uncredited]
- Son of Godzilla (1967) as Godzilla [land scenes, with Hiroshi Sekita]
- Destroy All Monsters (1968) as Military officer / moon base Engineer / reporter [uncredited]
- Latitude Zero (1969) Rocket crewmember [uncredited]
- Space Amoeba (1970) as Sergio Islander [uncredited]
- Star Wars: The Clone Wars writer Henry Gilroy named the pirate Hondo Ohnaka after Seiji Onaka and director Ishiro Honda.
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