When the planet Zeta is affected by massive global warming, which melts its polar ice caps, the farmers of Zeta are forced to build boats and take to the ever-rising seas. The only available land is controlled by the evil Lord Tyran and his warriors: to save the farmers and the planet, G-Force must first overcome Tyran and his mighty metallic fortress city...
Plotting revenge against the G-Force for destroying his mighty metallic fortress city on the planet Zeta, Lord Tyran decides to destroy the planet Trimbo, which is where Dr. Julie Sigmund is from, by erupting their many volcanoes. It's now a race against time for the G-Force as they try to prevent Tyran carrying out his plan...
Lord Tyran has now identified the G-Force as his greatest enemy, so he sets a trap for them on the planet Bharron. When the G-Force hear about this, they decide to catch Tyran in his own trap and bring him to the prison planet Hibernia 3. The only problem is, will the trap work?
Lord Tyran escapes from suspended animation on the prison planet Hibernia 3, and breaks out other criminal masterminds that were frozen there, as he wants to form a new League of Villains, with him as the leader. When the G-Force hear about this, they realise that they now have to fight an even bigger force of evil than before, and they engage Tyran and his new league in a battle above the planet Themea, but only one can be the winner...
Having been heavily damaged during the fight between the G-Force and Lord Tyran's League of Villains above the planet Themea, George Washington desperately needs an upgrade. The G-Force go to a junkyard on the planet Svarog, only to find that it's really a trap set by Lord Tyran, who has the CPU chip that George Washington needs in order to be upgraded. Can the G-Force get out and take the CPU chip with them?