Bog is a 1979 American independent horror film directed by Don Keeslar and starring Gloria DeHaven, Aldo Ray, Marshall Thompson, and Leo Gordon.
Dynamite fishing in a rural swamp revives a prehistoric gill monster that lives on the blood of human females. When a local is fishing with dynamite in Bog Lake, something larger pops to the surface: a green bug-eyed monster awakened from a long sleep, which promptly begins killing fishermen who stumble across its lair. When biologist Ginny Glenn (Gloria DeHaven) discovers the creature's evolutionary nature, the local sheriff decides to use various methods to destroy the beast. Eventually the monster is killed after it is rammed with a truck, but its eggs remain.