Actors who succeeded him in the role of the Master in "Doctor Who" (1963) were Peter Pratt in 1976 and Geoffrey Beevers in 1981. Anthony Ainley became the permanent replacement, portraying the role until the final episode of 1989. Eric Roberts played the role in the 1996 TV movie Doctor Who (1996) (TV).
He was the first actor to play the Master, the Doctor's greatest enemy, in "Doctor Who" (1963). He played the role from the 1971 serial "Terror of the Autons" to the 1973 serial "Frontier in Space". He was succeeded in the role by Peter Pratt, Geoffrey Beevers, Anthony Ainley, Gordon Tipple, Eric Roberts, Sir Derek Jacobi and John Simm.
Was a very good friend to both Jon Pertwee and Katy Manning. Both were devastated hearing about his death near Nevsehir in Turkey.