Shokhra

 was a Feledrin who escaped from his cell. It used to work in the cold fusion plant. He later met Melanie Bush and the cabbie when they arrived in the house. He later told of the arrangement with Louis. He also made a deal with the Doctor in that when a TARDIS mind was accidentally placed in the Doctor it was shared between the six heads of Shokhra and the Doctor so that the Doctor's mind wasn't overwritten. He later removed that part of the TARDIS mind from the Doctor and placed it in himself. Mel later suggested to put the TARDIS mind that was in him into the mainframe of the space station they were in. (AUDIO: Unregenerate!)