X-Brawn is the oldest of three Autobot Brothers. He enjoys extreme environments and can handle any terrain with ease. His love for thrills often leads him to climb tall buildings in car mode using his winch. X-Brawn is a martial arts master, known for his immense strength in his left arm, which he uses to execute lariats on Predacons. He is a reliable bot who doesn't say much but gets the job done.
When Ultra Magnus arrived on Earth and forced Optimus Prime into a Matrix combination that allowed him to share power with others, X-Brawn was one of the three Autobots involved in being "supercharged" by this energy. This new ability transformed them into more powerful versions of themselves, allowing Prowl and the others to shift into "Supercharge Mode" when needed for extra power boosts in battle. However, despite their supercharged modes, they were unable to defeat Galvatron in their final battle at Earth's core until Optimus Prime and Ultra Magnus challenged him and ultimately defeated the villain.