Dave Slitheen

Chris Slitheen was a member of the family Slitheen. In 2009 Another Slitheen (possibly his son) stole a Matter Compressor from the Pharos Institute however he was chased by Sarah Jane Smith and her Gang. He managed to escape and met with Dave Slitheen, they then planned used the matter compressor to turn Earth's atmosphere into a giant diamond. After Sarah Jane failed to stop them the Blathereen arrived and executed him and his associate. (SJA: The Gift)