There are few, if any, television franchises that are more lucrative than Doctor Who, but Steven Moffat, the current overlord of the BBC series, has been bequeathed a threat to the income stream.
Robert Holmes, the late scriptwriter, wrote a 1976 instalment of the series entitled The Deadly Assassin, in which it was stated that the doctor can only regenerate him (or her?) self 12 times. Peter Capaldi, when he takes possession of the Tardis at Christmas, will be the 12th Time Lord, which will mean his successor ought to be the last ever Doctor.
Peter Davison speaking with the authority of a former Time Lord, tells Mandrake that Moffat is already addressing the issue.
I know people are worried about it, but I think there will be a way around that rule,
I know that Steven has put in the groundwork already in an episode so that there can be more.
The idea that the Doctor only has12 regenerations was mentioned again in the show’s 20th anniversary special, The Five Doctors. Some purists have vowed to abandon the show if the Doctor breaks the law and survives his 12th regeneration.
Davison, however, hopes Moffat will get away with it as he likes the idea of one of his grandchildren continuing in the family business. His daughter Georgia Moffett has two children by David Tennant, 10th Doctor, and he has adopted her first child, Ty, from a previous relationship. “Three generations of time lords would be an amazing feat,” Davison says.