The Evil Captain Spider kidnaps Dr. Emeritus and brainwashes Inspector Blooper in an attempt to defeat Gigantor and gain control over a powerful new energy ray.
Professor Stinger is back and this time he's got Big Fang's robot brother Irontron, who's been built for one purpose only - to defeat Gigantor and jimmy Sparks once and for all!
General Shark has a new secret weapon - termites that eat steel and concrete. Now, no city is safe from a Shark attack. Can Gigantor exterminate the growing problem?
Gigantor is sent deep into the ocean to search for a sunken island and buried treasure. Instead, he finds the evil Thermal Updraft, whose hideout is guarded by the unbeatable Albatross robot!
Escaped convict Goldy Brix is attacking luxury liners from his underwater base and using his own giant robot, Blastro. When Blastro disables Gigantor, it's anybody's game!
It's the First World Robot Olympics, held in New York. First price, $1 million and a gold trophy. Taurus and Bulba, the favorite, and Gigantor, go head to head until Maxwell Schmoe kidnaps Gigantor!
Inspector Blooper, Jimmy and Gigantor head for the South Pole to stop Dr. Katzmeow, an evil genius who plans to take over the world starting with Antarctica.
The only way to stop Evil Wizard Dee Doo's plan to take over the world is to find his secret base, but it's protected by a huge magnetic shield that even Gigantor can't penetrate.
Mr. Skee Matic kidnaps Jimmy and takes him to his secret headquarters where he shows him his robot collection - the largest in the world. Among them, his newest acquisition, Gigantor!