Walter Vincent

 was the Grand Administrator of Earth. The Eighth Doctor and Narvin initially thought he was, but he was in fact a construct, created from Molly O'Sullivan's memory of her father Patrick O'Sullivan. He got everyone to obey the Master. He called Molly "Molly Dark Eyes". The Doctor transmitted the retro-genitor particle through him to destroy the Eminence. (AUDIO: Rule of the Eminence)