Four Arms is a Tetramand who first appears in Washington B.C. He is Bens 6th transformation
Four Arms is a big red alien with four arms. He is very muscular and the Omnitrix symbol is on his arm. He has a black line on the top of his head going down.
He can do enumorous things using his strentgh. He is Bens strongest alien so far.
He first appeares in Washington B.C. to fight The Mammoth. He easily defeated it and then grabbed the bird to save Gwen. However once the bird flew very high it shook Four Arms off which caused him to crash into the ground and transform back into Ben.