The Man from Planet X

The Man From Planet X is a 1951 American science fiction film starring Robert Clarke, Margaret Field and William Schallert. It was directed by Edgar G. Ulmer.

Soon, Lawrence discovers that the alien is gone, as is the professors daughter, Enid Margaret Field. Tommy, the village constable Roy Engle, reports that others from the village are missing as well. Lawrence takes the constable to the site where the spaceship has been, but it is no longer there. With more people now missing including Mears the phone lines dead and the village in a panic, they get word to Scotland Yard by using a heliograph to contact a passing freighter.When an Inspector David Ormont and sergeant fly in and are briefed on the situation, it is decided that the military must destroy the spaceship. Lawrence objects that doing so will also kill the people who are under the aliens control. With the mysterious planet due to reach its closest distance to the earth at midnight, Lawrence is given until 1100 to rescue them. He sneaks up to the ship, and learns from Mears that the alien intends the ship to become a wireless relay station in advance of an invasion from its home planet, which is dying. Lawrence orders the enthralled villagers to leave and attacks the alien, shutting off its breathing apparatus, then escapes with Enid and the professor. Mears, however, returns to the ship and is killed when the military destroys the ship, just before the planet approaches and then recedes back into outer space. ........

Source: Wikipedia