Diverted to VictorianLondon by persons or powers unknown, twenty seventh century archaeologist, adventuress and inadvertent absent mother Bernice Summerfield finds herself beset with problems of a kind that those unused to time-travel could barely even imagine.
What are the plans of the mysterious Lord Straxus? Who is Ludvig Cooray and what has the number seven to do with all this? Can Bernice acquire the help of Mycroft Holmes, the cleverest man of the age, and more importantly how is she going to get home?
For the purposes of this list, a "regeneration story" is one in which a regeneration is actually and initially depicted. For this reason The War Games is not included below, even though it is commonly thought of as a "regeneration story". It doesn't actually include a clear scene of regeneration, and the preponderance of stories in other media confirm that the Second Doctor did not regenerate at the end of it. Additionally, immediate post-regeneration stories, like the 2005 Children in Need Special — and ones like Castrovalva, where the regeneration sequence was replayed — are not included.
Regeneration is usually considered a biologic process exclusive to Time Lords and a few other species. However, some consider Regeneration and The Eclipse of the Korven to also be "regeneration stories", though neither describes anything close to a biological process. Korven is a particularly hard one to include in this list, because K9 is said to "regenerate" but is largely physically unchanged.