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Boulder is a Rescue Bot that transforms into a bulldozer and is partnered with Graham Burns. Boulder is fascinated with Earth culture and is always eager to learn more from books and other sources. He has a very kind and friendly demeanor. In "Big Game," Boulder works on an Energon Patch to use on Optimus Prime's Primal Form and tests it by scanning a Triceratops model to assume this Primal Form, thus making him the second Rescue Bot to be a Triple Changer where this form enables him to perform tremor attacks. After some tests with the Energon Patch, Boulder and Graham arrive where they free Optimus Prime's Primal Form from Colonel Quint Quarry's trap and apprehend Colonel Quint Quarry.