The Man From Planet X.

A spaceship from a previously unknown planet lands in the Scottish moors, bringing a humanoid alien to Earth near the observatory of Professor Elliot (Raymond Bond) Professor Elliot and his friend, American reporter John Lawrence, help it when it is in distress and try to communicate with it. A colleague of the professor, the unscrupulous and ambitious scientist Dr. Mears, discovers that the humanoid peaks in musical tones and tries to force from it the metal formula for its spaceship. Mears returns to the spaceship and is killed when the military opens fire and destroys it shortly before the planet is nearest Earth.