It was later revelved when he met the Doctor and Whem on New Earth that Davros created him. The Cult planned to burn New Earthu up. The Doctor designed a weapon and without mercy he attacked and killed all the Cult except Tet who escaped. (DW:Daleks on New Earth) He used temporal shift and ended up in a dumpster. (Dalek Stories: Tet.) He was stranded onEarth for 2 years. (Dalek Stories Tet) Heb encountered the 20th Doctor and hunted him but ended up falling down a cliff and perishing. The Doc was not aware anything was happening. (DWBIT:The Unknown Assasian)