Jabberjaw (a 15-foot air-breathing great white shark) and The Neptunes (a rock group made up of four teenagers — Biff, Shelly, Bubbles and Clamhead) travel to various underwater cities where they encounter and deal with assorted megalomaniacs and supervillains who want to conquer the undersea world.
Episode 1
Jabberjaw and his friends try to defeat Dr. Lo, who has developed a growth ray which is threatening the underwater cities.
Episode 2
After Biff gets them kicked out for a publicity stunt, aliens land in the undersea city of Hydrostan. It's up to Jabber and the gang to stop their invasion.
Episode 3
Jabber and the Neptunes are taken prisoner by the Prime Minister of Atlantis when they discover his wicked plan to overthrow the underwater kingdom.
Episode 4
Jabber has to compete against a powerful robot in the Underwater Olympics when he accidentally swallows a secret spy formula.
Episode 5
Jabber and the gang accompany an archaeologist trying to find an ancient treasure before an infamous general can sabotage his plans.
Episode 6
Jabberjaw comes under attack from the Brotherhood of Evil when he accidentally picks up their stolen power helmet.
Episode 7
Jabber and the gang become embroiled in Commander Shark's attempts to kidnap the undersea ambassador and take over the world.
Episode 8
Using a powerful beam of ice, Coldfinger confiscates all the deeds to the richest mines in Aqualaska, except for Jabberjaw's gold mine.
Episode 9
Jabber accidentally frees a mean genie named Voltan from his lamp; however, the Order of the Secret Thieves plans to steal it during a concert.
Episode 10
Jabber and the gang try to catch an evil scientist, whose experimental ray gun causes plants to attack.
Episode 11
Clam Head is mistaken to be a brilliant scientist by the henchmen of Sculpin and kidnapped to create a time machine.
Episode 12
Jabber and the gang are taken prisoner by Madame Sargasso, a sorceress who wants to turn them into her zombie slaves.
Episode 13
Jabber becomes embroiled in Dr. Cybron's attempts to hold the leader of the underworld for ransom.
Episode 14
Jabber and the gang inadvertently become embroiled in an evil scientist's dastardly plan to destroy the world's oil supply.
Episode 15
Jabber and the gang are taken prisoner by the menacing Piranha, who wants their rocket fuel to take over the Undersea States of America.
Episode 16
Jabber and the gang agree to help the people of Barcelaqua when the villain El Eel threatens to turn them into stone.
