Jeepers It's the Creeper

A school dance at a rural barn is disrupted by The Creeper, a zombie-phantom-like figure who has been seen robbing banks at night in town. The gang searches the woods and countryside for clues, with being chased by The Creeper, encountering an insane old hermit that wants them to stay with him, and a newborn baby chick, who comes to think Scooby-Doo is its mother.