The Blob is an independently made 1958 American horror/science-fiction film that depicts a giant amoeba-like alien that terrorizes the small community of Phoenixville, Pennsylvania. It was not until star Steve McQueen became famous with the TV series Wanted: Dead or Alive that the film became a hit at the drive-in theaters.

The film was Steve McQueen's debut leading role, and also starred Aneta Corsaut. The film's tongue-in-cheek theme song, "Beware of the Blob", was written by Burt Bacharach and Mack David and became a nationwide hit in the U.S. It was recorded by studio group the Five Blobs—actually singer Bernie Nee overdubbing himself.