 As well, it contains clips from "The Parting of the Ways", "The Christmas Invasion", "Human Nature" and "Gridlock" and audio clips of previous Masters when the Professor's watch is beckoning him to open it, including Anthony Ainley's laugh and a line Roger Delgado spoke in "The Dæmons".Derek Jacobi plays the fifth version of the Master whom the Doctor has encountered on screen, and John Simm is the sixth.At least one television pundit speculated whether "Mister Saxon" was an intentional anagram of "Master No.