Glitch is excited when Lars refits the Grimbler with new, clean biogas boosters that could make it even faster than the Vroomster! The boosters run on gas made from food waste, and luckily there is plenty of leftover food in the academy canteen for the Grimbots to gather up. But Glitch overloads the boosters and BOOM! He loses control of the Grimbler and is sent flying across the academy, out of control. Lars leads the Go Jetters into action by giving chase across land and sea in the their all-action vehicle, the Truckster. But with the runaway boosters zooming towards Ubercorn, the Grimbots and the academy, the Go Jetters need click-ons to stop them!

The Go Jetters travel to the Valley of Balls in Kazakhstan, where they find thousands of rocks which are almost perfectly round. Meanwhile, Grandmaster Glitch is seeking the ideal ball to use to practise his bowling - something big and heavy. What could be better then one of the giant balls of rock from the Valley of Balls? But things start to go wrong for the Grandmaster when he rolls the ball of rock right out of Grim HQ and straight towards an unsuspecting group of tourists. The Go Jetters take to the Vroomster to try to stop the ball.