Congresswoman Helen Browning comes to visit Coral Key Park and Marine Preserve to decide whether government funds should be appropriated to keep the park open.
A savage killer whale blockades a strip of coastline, capsizing boats and harassing skin divers and swimmers. Mike Nelson, armed with a shark-harpoon gun, engages the killer whale in a wild and desperate undersea battle.
When Flipper finds a Spanish doubloon on the ocean bottom and brings it to Bud and Sandy, rumors about Spanish Treasures spread quickly and an underwater gold rush ensues.
Mr. Marvello, a down-and-out ventriloquist thrown out of the Parkey Bros. Circus, wanders into Coral Key Park.
Mike Nelson tests the security of underwater approaches to an oceanside rocket fuel plant. At the mouth of a tunnel leading to the heart of the plant, he captures two saboteurs -- but only after they have fired a delayed action torpedo into the tunnel!
