It has to kill us or starve and we've got to kill it or die. It's the future, 1973, and the first manned expedition to Mars is marooned. When a rescue team finally reach the stricken ship they find only one survivor - the leader, Col. Edward Carruthers. He claims that an alien life form killed his crew but this is met with scepticism as Carruthers tells the story... Pretty much forgotten un...