Marine Boy, suspecting sabotage, investigates when an "unsinkable" nuclear ship is lost during a tornado.
A great underwater oil field is discovered by Dr. Mariner, but while drilling, the team at Satellite Station 23 collapses and Marine Boy is sent to investigate.
Marine Boy, Bulllton and Piper are ordered to the fishing boat Whoppercatch to investigate an SOS regarding a sea monster.
After arriving at the crash site of an unidentified aircraft, P-1 witnesses an explosion and find themselves surrounded by huge, electronically controlled, poisonous starfish.
Bullton and Piper find a missing fishing boat with no one aboard. Marine Boy and Splasher set out to solve the mystery of the crew's whereabouts.
During an expedition organized by Ocean Patrol, Dr. Mariner and his crew find a spear which is modelled after one known to be thousands of years old.
In order to provide more food to the people of the world, Dr. Mariner experiments with raising larger fish, but it is missing one ingredient which can only be found in the deepest part of the ocean.
Marine Boy, Bullton, and Piper are sent to the Arctic Ocean to search for 11 missing men and to explore the myth of a ghost ship.
Marine Boy answers an SOS and finds no ship in the area of the signal. What he does find, however, is electronically controlled artificial seaweed.
Marine Boy enters a kind of submarine Grand Prix using a special boat invented by Dr. Mariner and Professor Fumble, but the sub is blown up before the race finishes.
A strange statue which contains vast treasure is discovered by tycoon Mr. Goldpocket while flying over it in his plane.
Mr. Smirch steals nuclear rock drills in order to obtain uranium enough to take over the oceans of the world.
A mysterious time capsule is found by Marine Boy and Splasher who take it to Dr. Mariner.
Flim Flamboyant disguises his sub as the P-1 and leads ships to a cave where he steals their precious cargo.
A proton bomb with its safety catch unhooked is stolen by a secret agent.
Splasher is caught in the sound waves emitted by Scorpo, who plans to sell the dolphins of the world to Smirkoland for use as robots.
Marine Boy and Splasher stumble on an underwater farm where plants grow quickly due to the rich soil.
Dr. Shinedor has invented an electronic laser beam which he can use to shock and punish man for hunting and fishing for pleasure.
Despo Montebank, who claims to be the Emperor of the Pacific Empire, holds Marine Boy and his crew captive in an electromagnetic field and tries to make them obey him.
Marine Boy leaves the P-1 to search for the wreckage of a ship sunk by Captain Rex Rancid's electronic missiles.
Marine Boy and P-1 are sent to investigate the disappearance of ships at the North Pole, apparently due to icebergs.
While testing the electronic fence at the Ocean Patrol underwater research ranch, Professor Fumble and Mr. Washer are captured and held on an invisible ship.
Accidents continue to occur in an underwater power station which is under construction, and Marine Boy discovers tremendous currents which he feels are man-made.
Little Clicli sees a submarine attack a diamond-bearing ship and picks up the key after the captain of the ship throws it overboard to keep it from thieves.
In leading an important cargo ship through the narrow strait, P-1 must use torpedoes to clear the way.
A lighthouse beam changes course mysteriously and ships in the area are running around as a result.
P-1, along with Bullton and Piper, is reported missing and Marine Boy and Splasher go search for them, finding them in a cave being held prisoners of Hambone and Skwid.
The villains X-3 and Professor Stormbrane are planning to set off a super bomb inside a volcano and send out Shell boats to attack the SS Rubadubdub.
Marine Boy and the P-1 encounter synthetic jelly monsters which attack a secret airship whose torpedoes only make them multiply and grow larger.
Marine Boy and Dr. Mariner set up a trap to catch pirates who sink ships and steal the cargo. After Dr. Mariner is caught, the villains give Ocean Patrol 24 hours to surrender their base in return for Dr. Mariner's freedom.