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Invasion of Astro Monster (1965)

IMDb: 6.3
1965

Astronauts investigate Planet X and encounter the Xiliens, who ask Earths people to help save their world from Monster Zero As one astronaut forms a romance with a mysterious woman, he uncovers the Xiliens true intentions

Destroy All Monsters (1968)

IMDb: 6.5
1968

At the turn of the century, Earths monsters have been safely rounded up and studied on Monsterland Chaos erupts when a race of she aliens known as the Kilaaks unleashes the monsters across the world