Major Dennis, Danny, and Rex are flying, but put down on an uncharted island for repairs. Come morning, the island starts sinking and they barely take off. Flying to a second island, the natives hide in fear until Rex saves a child from the river. They must pay tribute to the "evil spirit" who rules the sinking-and-reappearing island. Our heroes follow the tribute and discover a large statue that talks - because evil men hide inside. Rex routs them and Major Dennis fires rockets to destroy the false idol.
Bobo opens a bank account with his one dollar a week salary. Sheriff quote: "Take it easy, Bobo! You're always in such a rush to bank your money!" Bobo quote: "Listen to him talk! He can keep his money in his pocket!" But an error in the bankbook balance sets Bobo investigating. He trails a car and finds a bank clerk held prisoner. Starting the car, Bobo flattens the garage door on the crooks - and gets a $500 reward for his bank account!
Visiting Professor Barrett, Danny and Rex investigate why flamingos have failed to return to their nesting grounds. Rex follows a trail, dodging swamp fire and alligators. They meet two escaped convicts with rifles, but Rex bowls them over. The convicts kept the flamingos away. Mystery solved!