Main article: Four Arm's page on the Ben 10 Wiki
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Four Arms is a humanoid alien transformation that has a muscular physique. He has red skin, four green eyes, two pairs of arms (hence the name) with four-fingered hands. He wears a white shirt, black pants, and black gloves. There is a vertical black stripe that goes across from his back to the front of his body, the stripe breaks between from his mouth.
Powers and Abilities
Four Arms' powers and abilities are the same from his native universe. His most prominent ability is his enhanced strength. From "Crossover Nexus", he lifted up concrete asphalt and throw it to Pen with no struggle. He was able to hold up a collapsed building to protect him and K.O. and tossed it to escape. He punched a hole through an abandoned building.