The Blob is an independently made American horror/science-fiction film from 1958 depicting a giant amoeba-like alien that terrorizes the small community of Downingtown, 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 theatres. Today, the film is recognized as one of the quintessential 1950s American sci-fi/horror films.
The film was Steve McQueen's debut performance, and also starred Aneta Corsaut. The film's tongue-in-cheek theme song, "Beware of the Blob" (recorded by studio group The Five Blobs), was written by Burt Bacharach and Mack David and was a nationwide hit in the U.S.
The Blob is an amorphous creature from outer space which lands on Earth encased in a meteor. Two teenagers, Steve Andrews (McQueen) and Jane Martin (Corsaut) take a car to try to find where the meteor has landed. Meanwhile, an elderly man (Olin Howland) has heard the meteor crash near his house. He goes outside and upon finding it pokes it with a stick. The rock breaks open, and he finds a small mass of jelly-like substance inside. This "blob", which is actually a living creature, crawls up the stick and attaches itself to his hand. The man runs hysterically onto the road, where he is almost hit by Steve's car. Steve attempts to help the man, but he begs to be taken to the doctor. They arrive just as Doctor Hallen is about to leave the office. He takes the old man in and anesthetizes him, but finds that the mass has grown larger. Finally, it dissolves the old man completely and rolls to the floor, where it also engulfs and eats the nurse and later, the doctor himself.
Steve and Jane return to the office, now apparently empty, but in time for Steve to see the Blob consuming the doctor. He and Jane go to the local police, kindly Lt. Dave and cynical Sgt. Burt, and they go to the office where they find no sign of the creature or the doctor. Dismissing Steve's story, the police return Steve and Jane to their homes and parents. Later, they sneak out and get Steve's friends out of the late-night "Spook Show" (Daughter of Horror) and try to convince them that the Blob is threatening the town. The Blob, in the meantime, has consumed a mechanic and later (off camera), the janitor in Mr. Andrew's grocery store. Steve and Jane find it here, and it chases them into the walk-in refrigerator, but for some reason it does not follow them in after starting to squeeze under the door. They then escape and set off the town's fire and air-raid alarms. The whole town gathers and demands to know what is going on. As the townspeople and police angrily confront Steve, the Blob enters the Colonial Theater, engulfs and eats the man in the projection room, and then attacks the audience. As the patrons run screaming out of the theater, the truth of Steve's story is finally confirmed to everyone.
The Blob then follows Steve, Jane, and her little brother into the local diner, which it engulfs. The kids, along with the owner and his wife, run into the cellar. The police try to kill the Blob by dropping a power line onto it. This fails, but sets the diner on fire instead. The people are trapped inside with no hope of escape, until Steve starts to quench the fire with a fire extinguisher. The Blob, which is trying to reach them in the cellar, recoils. Steve tells Lt. Dave that the Blob cannot stand cold (explaining why it did not consume them in the refrigerator), and so, taking the fire extinguishers from the local high school, they attack the monster with carbon dioxide. Soon, the Blob is frozen solid, unable to move or engulf anyone. The film closes with a scene of a military plane dropping the Blob into an Arctic landscape.
The film ends with the words "The End", which then morph into a question mark, suggesting that the Blob may return (which it does fourteen years later - this time, to a Los Angeles suburb - in the sequel, Beware! The Blob).