All begins when Lynn, an ordinary 13 year-old boy, finds a strange cat on his way home. Mistaking a powerful robotic Bolt Cat belonging to the super villain Gala-Gahs for a stray cat, he brings it home and discovers that they can merge into a cat-boy speedy superhero. As Lynn struggles to take stock of his new powers with his feline companion, he realizes there are other powerful kids like him.
When it comes to looking after stray cats, Lynn is on the ball. When it comes to schoolwork however, it's a different story. Mistaking C-66, one of the most powerful weapons in the universe, for a stray cat, Lynn takes Bolt Cat in and discovers that they can merge into a speedy superhero.
Feasting on the energy of humans, a mass of mutant plants turn the city's hospital into a madhouse. Yuna and the G-Fighters subdue the plant monsters. Yuna's father, who had hitherto considered her telekinetic abilities to be a disease, is forced to backtrack a little on his opinion once he sees what she is capable of.
Robot scientist Dr. Madd has it out for the company that fired him. Yuna, Lynn, Mook and Noran join forces to wrest hostages from Madd's control. This challenge brings them together and leads to the birth of the G-Fighters.
In the most decrepit region of Metropolis, ironically named "Newtown", a series of mysterious missing-person cases have transpired. The G-Fighters finds out that DJ Ziller is behind the madness, and that he's controlling the residents of Newtown with his music. The G-Fighters figure out what's going on and it's Yuna who cracks this case.
In a frozen-over underground lake outside Metropolis, ice worms begin to attack people. In this Mook showcase, the question is, will Mook choose justice or his friends?
The heroes are enticed to attend a "Mummy Festival" when they in turns receive vouchers for free entry, rides and concessions at the park. The only problem is that the sole requirement for membership is donning the mummy costume, which turns the wearer into an eternal mummy slave.
With the city in panic followed by continued acts of terror, it's a battle of wits to see who can figure out the next target before it's too late. Our heroes discover that it's a cult leader and his underlings that are behind the ice attacks across the city.
Yuna's telekinetic powers disappear briefly, leaving her in grave danger. In this episode explains how she came to have such powers in the first place. After her abilities get an upgrade, she faces off with Rammasun, one of the most powerful of the Ten Miscreants.
A Bolt Cat imposter in on the loose! Is this going to shake Lynn's faith in Bolt Cat? Gala-Gahs's butler, Fredrick, has created a fake Bolt Cat to throw Lynn and Bolt Cat's relationship into turmoil. A story of camaraderie between Lynn and Bolt Cat and the tragedy of Black Cat, whose fate is inextricably tied to that of his master, Fredrick.
The G-Fighters find themselves trapped in a cage with the most dangerous monster in the universe, the sandworm. This episode showcases the ingenuity of the G-Fighters as they manage to escape from the cage and defeat the gang that trapped them there in the first place.
An alien ship is buried deep in the desert. The answers to all that has plagued Metropolis can be found in the black box onboard. Mook wakes up to find himself trapped onboard with a bunch of gigantic scorpions. It's a do-or-die struggle to flee the ship and get back above ground.
Billis has come to Earth to vindicate the 10 Miscreants, but if he can't eliminate the G-Fighters before dawn, all the Ten Miscreants will be killed by the doomsday bracelets they wear on their wrists.
Chief Moss and our heroes have awoken a sleeping giant. Finally all of Noran's memories, including his storied career as a crack operative in the Space Police come flooding back. Bolt Cat betrays Lynn and returns to his original master, Gala-Gahs, but won't carry out the order of Gala-Gahs to eliminate his old friend Lynn. Metropolis descends into darkness.
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