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.

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.

Jabber and the gang get mixed-up in Dorsal's plan to overthrow the queen of Atlantis and become king himself.

Jabber competes in the 2076 Undersea Olympics against a robot in order to unmask Z, the leader of a worldwide criminal organization.

Jabber and the gang accidentally join Professor Acosta's expedition to find the treasure of Panaqua, and have to protect him from the villainous Octopus.

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 that the Neptunes have kidnapped Commander Shark, so Jabberjaw must prove their innocence.

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 Petrolaqua 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!