After
Roger Delgado,
Peter Pratt,
Geoffrey Beevers,
Anthony Ainley,
Gordon Tipple,
Eric Roberts, Sir
Derek Jacobi, and simultaneously with
John Simm, he is the ninth and youngest actor to play the Master, the Doctor's greatest enemy, at the character's age of 8. He played the role, uncredited, in
The Sound of Drums (2007),
Last of the Time Lords (2007),
The End of Time: Part One (2009), and
The End of Time: Part Two (2010).