Gears is an Autobot who is always grumpy and complaining.
Primax 984.0 Gamma (Marvel US)
Gears was an Autobot soldier under the command of Optimus Prime during the Great War on Cybertron.
In 4 MYA, Optimus Prime assembled a group of Autobots that included Gears to take off on the Ark to destroy the asteroid belt that threatened Cybertron to ensure a safe passage of Cybertron through the Solar System. After the asteroid belt was dealt with, the Decepticons under the command of Megatron attacked the ship and Optimus Prime charted a course to crash the Ark into Earth to take out both themselves and the Decepticons. The Ark crashed into Mount St. Hilary, deactivating all the combatants on the Ark.
In 1984 CE, an eruption reactivated the Ark's computer Aunty who rebuilt all the Transformers, including Gears, with new Earth-based alternate modes. The Decepticons fled and the Autobots took roll and subsequently observed the traffic of Earth, assuming that the mechanical creations on Earth were the dominant lifeform of the planet.
Primax 984.17 Alpha (US G1 Cartoon)
Gears was an Autobot soldier under the command of Optimus Prime during the Great War 4 million years ago. He was part of the crew of the Ark that abandoned Cybertron in search for a new source of energy. The ship came under attack by the Decepticon warship Nemesis, and the ship crashed onto Earth, lodging itself in a volcano and sending the combatants into Stasis Lock.
In 1984 CE, Gears was re-activated by his fellow Autobots with a new Earth-based vehicle form. Optimus had Jazz put together a battle group that Gears was a part of with the purpose of stopping the Decepticons. The Autobots then deployed to an oil rig under attack from the Decepticons.
Primax 1005.19 Gamma (IDW G1 Comic)
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