The Doctor (Doctor Who) Time Lords a fixed number of twelve regenerations, meaning that every Time Lord had a total of thirteen incarnations including the original. The plot of "The Time of the Doctor" involves the Doctor receiving a new cycle of regenerations from the Time Lords before his expected demise, triggering the regeneration into the Twelfth Doctor, played by Peter Capaldi. The origins of the programme were explored in the docudrama "An Adventure in Space and Time" as part of the 50th anniversary celebrations of "Doctor Who", which starred David Bradley as William Hartnell. Although Time Lords resemble humans, their physiology differs in
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"