U.L.T.R.O.N. 5 (Earth-606)

U.L.T.R.O.N. 5 was an artificial intelligence created by Hank Pym to protect mankind. However, it went out of control, and took over the Avengers Mansion. When the Avengers fought back, Ultron created an android body for itself out of scrap metal, and piloted the body as it fought against the heroes. Ultron was later on destroyed by "Technovore", a special destructive virus created by Tony Stark for emergency use. However, as revealed by the Squadron Supreme, Ultron came back at some point, but it is not known how or when.