Devil Monster (1936) is an American adventure film directed by S.

Edwin Graham.

Synopsis:
A schooner suddenly disappears at sea.

Years later, evidence that there may be survivors causes schooner crewman Jose's mother to hire a tuna boat to investigate.

They discover a boy living happily on a South Sea island and abduct him when he refuses to leave with them.

However, Jose takes his revenge by leading the ship to the hideout of a mysterious giant manta ray.