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Optimus was a young and optimistic recruit in the Autobot Academy, wanting to face off against real Decepticons in a battle as part of the Elite Guard. Unfortunately, he missed the war by a few million years, and eventually failed to pass the Academy. His ambitions and dreams crushed, Optimus was instead assigned command of a small maintenance crew for the tedious and boring duty of repairing and cleaning-up the Space Bridge network. But when the Autobot crew accidentally comes across the very powerful, life-giving All Spark which was lost at the end of the war, they are suddenly ambushed by the greatly-feared leader of the Decepticons, Megatron, and his own broken army of experienced soldiers in their search for the legendary artifact. The Autobots get away from the Decepticon warship, and Megatron is destroyed in a fluke explosion, but damage causes their ship to crash on an unknown planet. Optimus Prime and his crew go into emergency stasis lock for 50 years, and reactivate in the future underneath Lake Erie near Detroit, Michigan. The Autobots reformat their alternative forms to match those of Earth vehicles so as to blend in. As they begin to explore Detroit, they come across a human girl named Sari Sumdac, whose father owns the largest robot manufacturer on the planet. When she sneaks aboard their ship to see more of the transforming alien robots, Sari encounters the All Spark, and it rebuilds her electronic key card to carry many of its own powers. With Sari’s help in understanding Earth’s unusual cultures and customs, Ratchet, Prowl, Bumblebee, Bulkhead, and Optimus Prime swear to protect the All Spark from rogue Decepticons until Elite Guard reinforcements arrive.