The Terror from Beyond Space

Earth's second mission to Mars finds the sole survivor of the first, Col Ed Carruthers, accused of murdering his crew. He insists a Martian monster killed them. Brought aboard the rescue ship, the creature stows away after a crew member leaves the door open and hunts the men, absorbing their vital body fluids. No one believes Carruthers until the killings begin on the return to Earth, with no way to stop this savage descendant of Martian civilization.