Not Of This Earth (1957)

An alien (Paul Birch) from a dying planet (their blood is destroyed by continuous exposure to radiation) is sent on a mission to earth to determine if the human species blood is compatible to theirs. If it is, then mankind will be used as a blood supply for their planet ..... or something like that. It's never a good idea to dwell on these loopy 1950s sci-fi plots. It's a rather silly "B" sci-fi horror courtesy of Roger Corman, who produced and directed. But the earnestness in which all the actors dutifully play their parts makes for quite an enjoyable piece of hokum. Plus, there's the often (unintentional) humorous dialogue and the occasional "in" joke like when scream queen Beverly Garland literally uses her screams as a weapon against Birch whose hearing is super sensitive to high pitched sounds. Garland is provided a romantic interest in the form of stick in the mud Morgan Jones but those Corman hipsters, Dick Miller (BUCKET OF BLOOD) and Jonathan Haze (LITTLE SHOP OF HORRORS) are around to provide some vinegar. Believe it or not, it's been remade twice already. In 1988 with ex-porn star Traci Lords in the Garland role and again in 1995 with Michael York in Birch's role.