Destroy All Monsters (1968)
In 1999, a race of she aliens, the Kilaaks, brainwash Earths monsters into attacking major cities, prompting a team of astronauts to stop the invaders while the monsters battle Ghidorah
Space Amoeba (1970)
A space probe is infiltrated by alien beings and then crashes on a remote Pacific atoll A group of people discover it to be inhabited by giant mutant monsters, created by the aliens in an attempt to conquer the world