It Came from Outer Space

It Came from Outer Space is a 1953 American blackandwhite science fiction film, the first in the 3D process from UniversalInternational. It was produced by William Alland, directed by Jack Arnold, and stars Richard Carlson, Barbara Rush, and Charles Drake. The films script is based on Ray Bradburys original story treatment not, as sometimes claimed, a published short story The Meteor.

Putnam finally discovers the spaceship and learns from its crew that they crashed on Earth by accident the aliens appear benign and only plan to stay on Earth just long enough to repair their damaged craft and then continue on their voyage. The aliens real appearance, when finally revealed to Putnam, is entirely nonhuman they are large, singleeyed, jelly fishlike beings that seem to glide across the ground, leaving a glistening trail that soon vanishes. They are also able to shape shift into human form using a telepathy screen in order to appear human and move around, unobserved, in order to collect their much needed repair materials. To do this, they copy the human forms of the local townspeople theyve secretly kidnapped to help them repair their crippled spacecraft. In doing so, however, they fail to reproduce the townspeoples exact personalities, leading to suspicion and eventually to the deaths of two of the aliens.To protect the aliens from the sheriff and his advancing posse, Putnam manages to seal off the mine in order to protect the aliens and to give them the time they still need to finish their repairs they finally do so and leave Earth but not before releasing, unharmed, all of the missing townspeople who assisted them. ........

Source: Wikipedia