The Decepticons assault a gold mine, provoking the Autobts to appear. During the battle, the Decepticons kidnap Gears, the objective of this mission. Gears has a special circuit that Megatron needs to complete his new invention, the Solar Needle which is a machine that will steal solar energy from the sun's core. When Megatron removes that circuit, this apparently acts as Gears' personality regulator, making him now friendly with everyone. He starts to willingly help the Decepticons. After a brief investigation, the Autobots discover Megatron´s plan and that the Sun will explode in 2 hours unless they stop Megatron's Solar Needle.
The Autobots arrive at the Solar Needle and engage the fight until Megatron takes Optimus Prime hostage, forcing the other Autobots to surrender. During the battle the Solar Needle was damaged, so Megatron orders Gears to repair it. Megatron prepares to execute Optimus Prime, but Prime asks for one last request. Megatron grants him that and Optimus Prime asks Gears for a favor of his own. Gears happily obliges and shoots Megatron, giving Optimus a chance to beat Megatron and force the Decepticons to retreat.
Wheeljack and Ratchet are tying to shut down the Solar Needle but can't agree on which wire to cut, so Optimus pulls one random and the Solar Needle gets shut down and gives back the circuit to Gears that Megatron removed from his body, returning him to normal. The Autobots destroy the Solar Needle and return to their base with Gears bitterly complaining about the jungle's humidity.