Teenagers from Outer Space

Aliens plan to use the earth as grazing land for their lobster-like monsters, the Gargons, but Derek argues that they should find a planet without "civilized beings." Placed under arrest, the rebellious teen escapes, not knowing he is the son of their leader, so Thor goes after him - with a disintegrator ray that turns people to bones. Derek befriends Betty Morgan and her grandfather, who are placed in jeopardy when Thor begins blasting virtually every earthling he sees!