Anthony Ainley (August 20, 1932 May 3, 2004) was an English actor best known for playing the Master in Doctor Who during the final decade of its original run. His film career largely consisted of bit parts or small roles in films such as You Only Live Twice, Inspector Clouseau and Oh! What a Lovely War, though he got to play more substantial supporting roles in his last two films, The Blood on Satan's Claw and The Land That Time Forgot. His pre-Doctor Who television career included guest appearances on The Avengers and Upstairs Downstairs. Ainley's portrayal of the Master is generally regarded as being more over-the-top than that of Roger Delgado (who had originated the role) with the exception of his last televised appearance where his performance is more subdued. He played the Master one last time in the video game Destiny of the Doctors.
- What Could Have Been: Ainley was offered the chance to reprise the role of the Master in a Big Finish Productions audio drama. He expressed interest but insisted on script approval, something that not even the actors playing the Doctor get. Thus, the part was recast with Geoffrey Beevers who had played the Master before Ainley.