The AI Robot brothers HouRyu and EnRyu have sucessfully completed Sytem Change and sortied alongside GaoGaiGar, but the firey, brash HouRyu and the cold, cautious EnRyu have opposite personalities. Will they be able to unite their purpose long enough to combine using Symmetrical Docking? If they can't, they won't be able to save GaoGaiGar, who is on a mission to rescue Mamoru from the depths of the ocean.

Professor Shishio and the GGG team are working around the clock to discover the secrets behind the Zonder Metal. This strange substance is turning the people of earth into bio-mechanical monsters. As the enemy steps up, GaoGaiGar receives backup in the form of Volfogg, the resourceful ninja AI robot developed by GGG's own computer genius, Entoji. But then Entoji's old rival, Inubouzaki, infiltrates HQ as a Zonder virus.

The menace of the Four Machine Kings spreads, backing GGG into a corner. Gai's ultimate attack, Hell and Heaven, is tearing GaoGaiGar apart, and each time he uses it could be his last. When a giant Zonder metal plant appears in the city, Gai doesn't hesitate to use the forbidden attack and sacrifice himself for everyone else.

When the brilliant Professor Akiko Hirata develops a gravity control system, the Zonders take control of it. To stop them, Gai must be mobilized with the Goldion Hammer. But the Hammer is so powerful, just wielding it is enough to destroy GaoGaiGar! In response, GGG creates a new AI robot with invulnerable armor, Goldymarg. Booted up with Hyuma's personality as a template, he's just as heroic as the Major and just as likely to ignore his orders and do whatever he wants.

Mamoru is an ordinary grade school student, until the day when his class is caught up in a ferocious attack by the mechanoid alien Zonders. Gai Shishio is sent by the UN alien defense force "3G" to defend the planet, and Mamoru also joins. They wage all-out war against the Zonders. When their backs are up against the wall, Gai Fuses with Galeon and 3G's Gao Machines to form the indomitable King of all robots: GaoGaiGar!

The Four Machine Kings finally take the fight to GGG personally while all of Tokyo is turned into an enormous Zonder metal plant. Before every person in the city is Zonderized, the brave robots must fight with everything they have, revealing Mic Sounder's true purpose, sacrificing one of their own, and even activating the ultimate weapon, Bullet X, which supercharges the G-Stones with the side effect of burning them out permanently!

Mamoru is an ordinary grade school student, until the day when his class is caught up in a ferocious attack by the mechanoid alien Zonders. Gai Shishio is sent by the UN alien defense force "3G" to defend the planet, and Mamoru also joins. They wage all-out war against the Zonders. When their backs are up against the wall, Gai Fuses with Galeon and 3G's Gao Machines to form the indomitable King of all robots: GaoGaiGar!

On a serene paradise island, untouched by modern technology, a dark secret lies undisturbed for centuries. Until a group of scientists, sent by a greedy land developer who plans to turn the sleepy island into the largest amusement park in the world, stumble across what appears to be a baby dinosaur.

It should have been a routine voyage, but as the starship XeBeC entered the warp-ring, an explosion in the engine room sent the starship hurtling out of control. Now, their only hope is to make an emergency landing on the planet below - Garaga.

In 994 A.D, a group of gargoyles 'sleep' in a frozen state during the day and engage in fierce battles at night. But then a spell is cast to immobilize the gargoyles completely, turning them permanently to stone. A thousand years late in 1994, a wealthy man buys the castle and airlifts it it to the top of his skyscraper. The ancient spell is broken, and the gargoyles find themselves adjusting to life in the Big Apple.

The ancient struggle between heroes and villains continues among the skyscrapers and bridges of a modern metropolis as Gargoyles returns for a second season. It's an adventure 1,000 years in the making! The suspense builds in season 2 as archenemy Demona unleashes a plot to turn the entire population of New York into statues, and flashbacks reveal even more of the history of these legendary figures.