The opening episode in the series introduces us to G-Force - 5 orphans enlisted to defend the Earth against enemies from the hostile world of Spectra. The first attack comes in the form of the space terrapin - a giant, turtle-like machine heavily armed and able to crush Earth's air & sea defences. G-Force is called in to deal with it, as the sinister Zoltar & the terrapin's C.O., Commander Gorak, attack Earth's shipping lanes and try to steal a substance known as VitaLumen. When G-Force members steal aboard the Terrapin, they find themselves in trouble when they are ...

When 2 astronauts returning from a mission disappear on reentry, G-Force is called in to investigate. Chief Anderson warns that the astronauts have probably been captured by Spectra as they had uncovered the location of giant, undetected alien bases on Earth. The data was kept on a tape in the astronauts' capsule but is now in the hands of Commander Gorak and Spectra. G-Force must locate the Spectrans' main base, rescue the astronauts, and find the data tape before it can be returned to Spectra...

On the planet Zarcadia, discovered by 7-Zark-7, a series of mysterious plane accidents are occurring. There is no mention of turbulence - only 'something white', according to Chief Anderson. When G-Force reaches Zarcadia Mark encounters a titanic mummy - apparently powered by a highly radioactive element called 'Plutonium X', manufactured only by Spectra. The only antidote, something called Anti-Pluton, is in the hands of its creator, a Dr. Sweet, who resides on the planet. His nephew, Buddy, is the son of one of the missing pilots. When his dad apparently returns, he...

An outsized mechanical death machine, the Space Serpent, is causing massive earthquakes and destroying Earth's oil refineries. Mark is sent to investigate with a geologist colleague, who suspects he can locate the source of the problem. The 2 men are caught in a quake and evacuate the building, but the geologist falls into a hole created by the Space Serpent. Despite Mark's best efforts, he is unable to rescue the man and is forced to flee himself. The man's daughter turns her anger on Mark, until the G-Force team brings her face-to-face with Spectra's horrible death ...

On the remote planet Mir, an underwater station is being built. A series of losses of equipment is delaying its construction, and Intergalactic Federation President Cain suspects that the planet's deposed leader is now in league with Spectra. It turns out he is correct. G-Force flies to Mir to investigate and finds themselves up against a fleet of warships, which self-destruct to release an army of deadly aircraft. The Phoenix quickly runs out of ammunition against the aircraft. Will they be able to escape?

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Mark is chosen to test pilot a new aircraft at an airshow. As he starts his takeoff roll, a sinister biplane appears and attacks his plane, crippling it and forcing Mark to bail out over the water. The pilot is the mysterious Captain Doom, a space pirate from the distant planet Urgos. Anderson immediately orders the team to go after Doom after rescuing Mark, but the fight ends badly for them as Capt. Doom's plane damages the Phoenix. After escaping back to Center Neptune, the team is ordered back to the mysterious space pirate's home world to face him.... on HIS terms.

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G-Force must attempt to stop a seemingly unstoppable black sphere war machine, but Mark wants to find a definite means to do so first over Jason's protests.

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Jason enters a continental auto race with a fellow driver named Lucy. However, Lucy is not all she seems to be. Although used by Spectra to infiltrate G-Force via Jason, Lucy is not able to complete her mission because she has grown fond of Jason. This is quite a feat, especially after the revelation that she is a robot.

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Spectra lands gigantic man-eating flowers it has created, and Princess, despite wearing a protective synthetic skin, is seized by the flowers.

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A rock band called the 'Dirty Name 5' is kidnapped & held hostage by Spectra. Their music becomes the main weapon in Spectra's newest flying death machine; it uses sound waves to shake buildings to the ground. When G-Force tries to attack the machine it gets on top of them & damages their ship. The only way to stop it now is to infiltrate the flying Spectran machine of death, rescue the band, and sabotage the ship... but will they be too late?

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When Riga is attacked by Spectra, G-Force pleads with Chief Anderson to go there and help the Rigans, including Mark's old ally Col. Cronus. Anderson refuses, choosing to await a formal request from Riga and analysis of Spectra's latest weapon, a giant bird-like death machine. However, G-Force disobeys Chief Anderson and flies to Riga to engage the Spectran death craft. They are badly defeated as the Spectran aircraft deploys a high-energy ray weapon, knocking out the crew & badly damaging the ship and forcing it down. The only thing that saves them is Col. Cronus, ...

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A gunslinger, released from a prison on Earth, is recruited by Spectran agents & brought to Zoltar. The Spectran leader places him in charge of a new weapon, the tank-like 'Crynogun'. When fired, the gun's ammunition will freeze any target it hits. G-Force decides to go to Spectra to take them on, and one at a time, are frozen by the Crynogun until only Mark & Princess remain. Will they defeat the lethal freezing ray of the Crynogun?

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Planet Riga is attacked & badly devastated by Spectra. Mark receives word that Col. Cronus has been killed, but then sees his old friend flying past the Phoenix. Chief Anderson orders Mark not to follow, but Mark disobeys orders and follows Cronus in his own plane. Anderson orders the team to find him, but as they start their search they are attacked by Spectra's giant alien wasp, gassed, and taken prisoner by Spectran troops. Mark is also captured; the man he thought was Cronus is in fact the ruthless Spectran leader, Zoltar. The team is imprisoned in an underground ...

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The Great Spirit has unleashed the lethal Space Octopus against Earth's power plants, and again G-Force is called in. Immediately the team finds themselves in trouble as the Space Octopus jams their weapons systems. As the Phoenix flees, the Octopus follows in hot pursuit and unleashes particle beam weapons and cell missiles on the ship, forcing it out of transmute & sending it down in flames. Seconds after G-Force evacuates, the Phoenix violently explodes. Now, the team must wait for a new ship and weaponry to defeat the seemingly invincible Space Octopus...but will ...

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Spectra robots infiltrate Metro City. G-Force rescues Tina from these robots. Jason is following Tina when he is taken by the robots.

There are reports of an alien Bigfoot in the Himalayas. Keyop sets off on his own to find Bigfoot and gets taken by Spectra men. Only they assume him to be one of the Spectra workers.

Zoltar deploys mechanical locusts to lead hordes of real locusts and devastate earth's food supply.

Chief Anderson cancels vacation and sends G-Force to repel Zoltar from a faraway planet. Zoltar is on the run alone in the jungle but he has set up many booby traps. Even the bananas are exploding to Tiny's dismay.

Princess and Keyop are at the amusement park when it's attacked by a giant mastodon. It's Zoltar behind the controls. Princess loses her G-Force shoe. She cannot transmute and could reveal her secret identity.

Zoltar is ordered to destroy the Conway Tape after scattered attacks to divert earth's defenses. Tiny Harper is slow to answer the call.

Voltar has a new awesome ray that can reverse the transmutation of the G-Force team.

Chief Anderson suspects Spectra is after the royal jewel collection of a tiny kingdom. G-Force finds the kingdom already infiltrated by Spectra goons.

Chief Anderson suspects longtime worker Greg is a traitor. G-Force investigates. Mark pretends to be defecting to Spectra. Voltar has kidnapped Greg's daughter.

Zoltar is given a new brain-warp weapon. In Agra, Zoltar has his robot peacocks corrupt the minds of the people.

Spectra attacks the remote underground Nuclear Complex 9. A commercial explosive is slipping further and further down threatening the world. Chief Anderson sends in G-Force with a top geologist and his monkey.

Dr. Stryker, seeking revenge against Chief Anderson, weaves an electronic space web over Stellar City causing a devastating drought and preventing relief from arriving.

Spectra agents salted the snow-pack leaving the earth's water supply poisoned for human consumption.

G-Force is on vacation. Keyop is taken with a bikini-clad girl. Julie Leslie is the daughter of earth's representative and possibly taken by Spectra's agents. Keyop sets off to rescue the beauty.

Tentacles in space.

Zoltar is setting up a submarine base under Witches Island near Center Neptune. Chief Anderson sends Keyop on a solo mission.

Spectra launches the Awesome Armadillo. Perched on top of a mountain with its impenetrable armor, G-Force must defeat the formidable weapon.

Secret agents from Spectra invade the Space Center planting an electronic targeting device. Center Neptune is under threat from Zoltar.

Zoltar launches missiles and hits the research center. Mark and Princess remain to evacuate the survivors. Chief Anderson is trapped.

A space colony is attacked by the forces of Spectra under Zoltar. Fearing a trap, Chief Anderson initially grounds G-Force.

Spectra uses a Time Warp Molecular Interchange Station inside the stone idol of Changu in the Himalayas to bring Robot Roman Charioteers from the past.

There is strange volcanic activity on Venus. G-Force is sent to investigate undercover as tourists. Of course, it's a plot from Spectra and Zoltar has laid a trap.

A rocket launch goes off without a hitch. Chief Anderson is kidnapped and the rocket goes off course. The team must rescue Anderson who is needed to bring the spaceship back on course.

G-Force faces the latest Spectra attack. Zoltar may have help from former G-Force member Donald Wade. Jason fails to join them after hitting Wade's mother with his car. Jason quits.

G-Force launches an attack on Spectra but something is wrong with Jason.

Futureworld is to be constructed in the Arctic using Dr. Gorky's formula to tap into the Earth's core. Mark accompanies the eccentric Gorky. After an emergency landing, they fall through the ice and wake up apparently in a nightmare future.

Zoltar threatens the Conway Tape which holds the computer defense codes for the entire federation. Mark and Princess investigate. After they are taken by Spectra spies, rebellious Jason goes on a rescue mission by himself.