Groth

 was one of the specimins the Scientist Dalek had collected as part of his experiments. He and Tiska were reminants of a Dalek occupations and the last two survivors of their race. He was more affected by the criogenic processes of the Daleks. He was obsessed with the Dark One. The Eighth Doctor noticed that Groth had been tortured by the Dalek Executioner. After raiding the Dalek armoury, he was killed by the executioner. (AUDIO: Mutually Assured Destruction)