Test pilot Larry Mangrum pushes his plane through the speed barrier at 1500 miles-per-hour. He crashlands in another dimension. An island populated by giant frog beings, where he meets two other missing pilots.
Robert Marley comes into possession of magic glasses, which make him see the invisible "Trogs". The trogs are causing deadly accidents all over the country and try to wipe out the human race. Temporarily looking like a trog, Marley can destroy the invisibility ray and saves mankind.