Dr. Lo has developed a growth ray that he uses to enlarge sea creatures and threaten underwater cities. Jabberjaw and the gang soon find themselves battling the evil Doctor and his creations.
Commander Dumax and his army of praying manti (who look exactly like Space Ghost's sidekick Zorak) have come to invade Earth. The Neptune's, on their way to Hydrostan, hear of a UFO sighting in the area ,and Biff decides to use this as a publicity stunt. Unfortunately, Clamhead and Jabberjaw are pursued by the aliens, the stunt backfires. In the meantime, Dumax gets an Earth identification device, which will help with his plans. The Neptune's are taken prisoner by Dumax but escape and must thwart his invasion plans.
Atlantis Prime Minister Dorsal executes a mock attack against his city to convince Queen Atlanta to allow him to attack other underwater cities. His goal is to conquer all of the other cities and then overthrow Altanta, making emperor of the undersea world. The Neptune's are accidentally ejected from the cruise ship where they are performing and are taken prisoner by Dorsal as invaders. They discover his plan and decide to inform Atlanta of his intentions.
In Oysteralia, spy ring leader Maximus and his assistant, Dr. Chemo, have built the world's most powerful robot, which they plan to use to transfer microfilm containing their spy roster. The Neptune's arrive in Oysteralia to play at the Olympic Village during the 2076 Underwater Olympics. Jabberjaw accidentally obtains and then swallows the microfilm canister, putting his life in danger. He and the robot enter the underwater obstacle course race, where he can make contact with the agent known as ""X.""
A general arives in the port of Sao Mareno, the capital of Aquantina, with a disk for archeologist Dr. Acosta. The disk contains hieroglyphics showing the whereabouts of the ancient treasure of Panaqua. The treasure is guarded by Panaquan tribesmen, but because it is desired by the evil Octopus, the government wants to place it in the museum. Shelley gets the Neptunes to Pier 213 instead of 312 (for their trip to Aquapuclo), and they join Dr. Acosta on his quest. The Octopus, who drives a submarine shaped like a squid, with working tentacles, traps Acosta's ship, and Jabberjaw is ejected by the automatic trash ejector as Acosta's sub fills with water. Jabberjaw rejoins them in Acosta's aquavan (like an escape pod) but is later captured and duplicated by the Octopus, who obtains the disk, but not before an imprint that Acosta can use is left in Jabberjaw. The gang fights hostile tribesmen but find the computer left by a previous expedition, which leads them to the central pyramid.
The Brotherhood of Evil threatens the undersea world when it learns that the Power Helmet, invented by Professor Ortega, grants its bearer's every wish.
The Ambassador of Aquatania suspects the Neptune's of kidnapping Commander Shark so Jabberjaw must prove their innocence.
The evil Coldfinger is after all the richest mines in Aqualaska. When Jabberjaw gets in the way, Coldfinger puts our favorite shark on ice!
Jabber and The Neptunes, touring the undersea kingdom of Hydrabia, meet Volton, an evil mass of energy who lives inside the magic Electrolamp.
The Phantom, with the aid of a powerful growth ray, plans to raise an army of ferocious prehistoric plants to make the Aqua International Corporation bow to his demands.
Jabber and The Neptunes encounter the sinister Sculpin, who has stolen an unfinished time machine from the brilliant Professor Thorstein.
Jabberjaw and the Neptunes accidentally go through the Bermuda Triangle and are taken prisoner by Sorceress Madame Sargasso.
While participating in a rodeo at Aqualand, Jabberjaw sees Dr. Cybron's henchmen kidnap the Rajah, and replace him with a robot duplicate. He tells the Neptunes, and Cybron tries to silence them by sending a runaway stagecoach over a cliff. When that fails, he captures Bubbles, and sends a duplicate of her to capture the others. The group rescues Bubbles and the Rajah, and discovers that Dr. Cybron himself is a robot.
The Neptunes try to win the top spot in the Trans-Marine Race while attempting to foil the evil plans of Dr. Robek.
Biff books the group on a tanker to Amsteraqua after another gig falls through, this being the cheapest way to go straight there. The Piranha has designs on ruling the Underwater States of America and captures the tanker for its load of special rocket fuel. The Neptune's scuttle the Piranha's rocket practically dismantling the control center and messing with the rocket's fuel delivery system. Jabber manages to launch the rocket accidentally to a different destination, with its cargo of sleep dust.
The eerie El Eel threatens to turn the entire undersea world to stone, and there's only one guy who can stop him: the great El Jabbo!
A music video starring JabberJaw and the Neptunes going up against an evil lizard and his horde of robots, featuring music by Pain. Aired between breaks on Cartoon Network during the late 90s/early 2000s as part of their Groovies series of music videos, which also reran on Boomerang until 2014.
