Chris

A young member of the Slitheen family posed as a human called Chris, using Chris' skin as a skin suit. He was very clumsy having sat on his own matter compressor, he also had a bad habit of pressing the wrong buttons. In 2009, he stole a Matter Compressor from the Pharos Institute, after which he was chased by Sarah Jane Smith and her gang. He managed to escape and met with another Slitheen. They planned to use the matter compressor to turn the Earth into a giant diamond. After Sarah Jane failed to stop them, he grabbed Rani Chandra and threatened to kill her. However the Blathereen arrived to send him and his associate to be tried and executed.

_{Biography from the TARDIS Data Core article, licensed under CC-BY-SA}