The appearances and disappearances of a Tyrannosaurus, Cyclops, and Rok, send Samson and Goliath to Dr. Desto's laboratory. He uses his time shield to bring in a variety of menaces from the past. Finally, he sends out a plague of locusts. Samson and Goliath drive the insects back. They are pulled back into the machine, but so is Desto. Samson then destroys the time shield for good to prevent Desto from ever returning.