Two stories featuring The Master - Terror of the Autons from the Pertwee era, and The End of Time part 1 and 2 - David Tennant's swansong. Roger Delgado is, was and always will be the definitive Master - here is a character you truly believe to be evil and a threat and all because of the fabulous acting of Delgado. It's little wonder the character stayed around for nearly every story of the next couple of years because he is just SO good in the role, and a perfect pair to spar with Pertwee. I often wonder how the shape of Doctor Who would have been if Delgado had survived the tragic crash in 1973. The story also features the Autons who Pertwee defeated temporarily in his debut story. A few dodgy effects aside, this story set the benchmark for Doctor Who in the future. Anthony Ainley was also a great master, and at least took Delgado's appearance, and finally got a great story in his final role in Survival - but John Simm?? No - he's not the Master. I think i'd have preferred to see Derek Jacobi with a black goatee in the role. As a story it's an epic and a deserving finale for Tennant, but they even had to bring in the timelords to show a proper menacing and a believable villain in Timothy Dalton. Simm is more like a spoiled child. At least, for the many people who complained about Autons being released in a box set, here it is for a bargain price.