Four Arms is the Omnitrix's DNA sample of a Tetramand from the planet Khoros, first appearing as one of Ben's original ten aliens and regularly appearing in the franchise since.
Four Arms is a humanoid alien that is twelve feet tall. He has well-developed muscles, two pairs of four-fingered arms, and dense armor-plated red skin. A black stripe goes from his chin to his lower lip, and he has four eyes: a main pair and a smaller pair below them, while he lacks ears or nose. He has whisker-like spikes on each forearm and two-toed feet.
In the Original Series, Four Arms wore a white T-shirt with a black line going down it and black pants with a strap on each foot that reveals his two toes and the back of each foot, and black fingerless gloves. He wore the original Omnitrix symbol on his upper left shoulder. His eyes were orange-yellow, and he had no hair.
In Ben 10: Ultimate Alien, 16-year-old Four Arms wore gold wrist and ankle bands, a pair of black underwear that has a gold waistband, and two golden sashes that went across his chest. His eyes were recolored green, he had a black ponytail, and he wore the Ultimatrix symbol on his chest.
