The Doctor Falls the episode, the Doctor (Peter Capaldi) must save himself and the remaining human population of a gigantic colony ship from Mondas, while also dealing with two different incarnations of the Master (Michelle Gomez and John Simm) at once. The episode features a cameo from the First Doctor, now portrayed by David Bradley. He had previously played William Hartnell, the original First Doctor actor, in the 2013 "Doctor Who" docudrama "An Adventure in Space and Time". Aboard the colony ship reversing from the event horizon of a black hole, the Doctor finds Bill has been converted into a Cyberman. The Master
Doctor Who – The Ultimate Adventure Doctor breaks his conditioning and defuses the bomb by putting it in a teapot. The play featured a female Prime Minister named in the script 'Mrs. T' (a reference to Margaret Thatcher). The Third Doctor addresses her as Margaret in the play whilst the Sixth Doctor addresses her as Maggie. The Third Doctor also mentions Denis, a reference to Denis Thatcher, Margaret Thatcher's husband. The play also features some musical numbers, including two from Crystal and "Business is Business" from Madam Delilah, the title of which acted as a catchphrase running throughout the play. The script featured numerous "Doctor Who"