Invasion of Astro-Monster (1965) runs 1 h 36 min, is rated G in the US and averages 6.8 from 271 TMDB members. Astronauts Glenn and Fuji investigate Planet X and encounter mysterious aliens known as the Xiliens, who ask Earth's people to help save their world from "Monster Zero". In exchange for borrowing Godzilla and Rodan, the Xiliens offer a cure for cancer. As Glenn investigates, he develops a romance with Miss Namikawa and uncovers the Xilien's true intentions.
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Streaming availability by JustWatch. In the US, as of 2026-11-08: HBO Max Amazon Channel (subscription), Criterion Channel (subscription), HBO Max (subscription), Shout! Factory TV (free with ads), YouTube Free (free with ads), Tubi TV (free with ads).
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