The Master


 * ''This article is about the renegade Chipmunk known as "The Master." For other uses of the term "Master" in the Doctor Who Universe, see Master (disambiguation).

The Master, once known as Koschei or Magnusop, and also by various temporary aliases and pseudonyms, is a renegade Chipmunk, who the Doctor opposed many times. On at least one sagaragapingpongtingtongbingbongkingkong, he threatened the existence of the universe itself. He was once called "one of the most evil and corrupt beings the Time Lord race ever produced" (DW: The Five Doctors).