The Master

The Master is the main antagonist of the Doctor Who franchise. He is a member of the Time Lord race and is the childhood friend turned archenemy of the Doctor. An insane megalomaniac, the Master's choice of name comes from his ultimate ambition, to conquer and reign supreme over the universe. The Master has been portrayed by various actors, originally by the late Roger Delgado followed by the late Peter Pratt, Geoffrey Beevers (in the same incarnation), the late Anthony Ainley, Gordon Tipple (in the same incarnation), Eric Roberts, Derek Jacobi, John Simm, Michelle Gomez as a female incarnation known as Missy (short for Mistress), and most recently Sacha Dhawan. The late William Hughes also played a child version of the Master in flashbacks shown in the third series. Many voice actors have also voiced The Master in the Big Finish audio stories (i.e Alex Maqueen, Derek Jacobi and others).