The Man from Planet X (1951)

Synopsis
An inexpensive but atmospheric sci-fi film, Man from Planet X takes place on a lonely Scottish island. Science professor Raymond Bond is monitoring the orbit of the mysterious "Planet X," which has entered the solar system and is travelling close to Earth. A spaceship lands from this planet, out of which pops a strange little man who looks something like an Easter Island statue. He has come to make contact with friendly Earthlings, but evil scientist William Schallert wants to exploit the spaceman's highly developed intellect for his own selfish ends. Schallert's nastiness turns the alien against the other Earthlings; the creature enslaves their minds and transforms them into zombies. Both Schallert and the alien are eventually destroyed--as Planet X, failing to establish a bond with Earth, spirals off into deep space. ~ Hal Erickson, All Movie Guide