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Simacore was a scientist on Cybertron who was imprisoned with his Mini-Con assistants Axiom and Theorem after he attacked several colleagues due to his short temper. Placed aboard the Alchemor, he and his cohorts escaped on Earth and attacked a Particle collider facility only to be engaged by Bumblebee's team of Autobots. The trio gained the upper hand due to Grimlock's fighting ability being impaired by his temporarily enhanced intelligence, and held his teammates hostage in an effort to get the Dinobot to surrender. However, after having his normal intelligence level restored, Grimlock was able to stall Simacore long enough to defeat him and rescue his teammates.