Optimus Prime is watching a video on the history of their war with the Decepticons. He is leader of a space bridge repair crew. While blasting rocks that are blocking a bridge, they discover the AllSpark. Unfortunately, a decepticon ship is nearby. They call Cybertron for help, and Ultra Magnus, leader of the Elite Guard, tells them to wait for an escort. However, Optimus gets a better reading on the Decepticon ship and learns it is not just a scout but a warship, so he tries to run for the nearest working space bridge. The Decepticons block their way. Meanwhile, the Decepticons on the ship are arguing, until Megatron enters. He knows the Autobots have the AllSpark. He disables their ship, then flies out to board. Just before he leaves, Starscream plants a bomb on his back. It goes off as he is blasting through the hull of the Autobot ship. The AllSpark activates the space bridge and takes the ship through, Megatron included, then destroys it behind them. The Decepticons abandon ship,... Written by
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But we're repair bots! We're not programmed for this kind of action!
Then consider this an upgrade.