Directed by Kenneth Hartford (as Kenneth Herts). 1980.

Monster is a movie, like Isle of the Snake People, that was made because someone wanted desperately to make it. It's the curious nature of a movie like this that keeps you watching. What compelled the makers, and how ridiculous and hopeful did they feel every single day of the shoot? Even when their hero can't act. Even when their plucky young protagonists aren't worth killing. Even when their rubber star looks silly in the sunlight. How disheartening and wonderful when the climax of your movie involves a dead sheep stuffed with TNT.