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 unver mais...