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
Space and Time (Doctor Who) the screen. The mini-episodes received mixed reviews; some scenes were thought to be funny, but other jokes were criticised for relying on sexist humour. "Space" and "Time" were later released on the DVD and Blu-ray sets of the sixth series. Amy Pond (Karen Gillan) is trying to get the Doctor's (Matt Smith) attention while he fixes the TARDIS. She discovers that her husband Rory (Arthur Darvill) is helping the Doctor by installing thermal couplings underneath the glass floor of the TARDIS. Rory and Amy then start a small argument about Amy cheating when she took her driving test, when the