A very nicely done "What If?" that doesn't focus so much on how the Doctor is different but how the world is different thanks to his absence. Shades of Turn Left in how everything is infinitely worse for everyone, and Nicholas Courtney does very well playing a much older, more cynical Brigadier. Mark Gatiss is also a nicely sinister Master, very much in the mould of Delgado and Survival-era Ainley. David Warner is, of course, a big highlight and it's no wonder why they asked him back for more stories and he became the breakout character of this range. He's wry, witty, wise and warm all at once and even though he doesn't get quite as much focus on characterisation as the other Doctors in the Unbound range, he's still a great presence.