Benji Tennyson is the clone of Benjiman Tennyson created by Vilgax to serve him and kill the original donor. Unfortunately for Vilgax, Benji had taken on some traits Ben possesed, refused her programing and escaped, rescuing those her captor had taken prisoner. According to Azmuth, she had gained an Omnitrix because it was fused to Ben's DNA when the sample was taken. She now helps Ben, Gwen Tennyson and Kevin Levin and is a member of their team.
Benji wears a green jacket, a black T-shirt, blue jeans and a pair of black sneakers, much like Ben's. Being his clone, she also had gained his brown hair and green eyes.