1997... and a lone exile arrives on Earth, years later than planned.
On the eve of the Handover, an advanced Chinese stealth bomber crashes in the hills above Hong Kong. The discredited United Nations Intelligence Taskforce has just 24 hours to steal the technology, rescue the passenger and flee to international waters.
Down by the harbour, there’s big trouble in Little England -- a bar owned by an old soldier who simply wants to forget the past. But an ancient evil is stirring in a place of peace.
The Doctor finds a world on the brink of terror. A world that has lived without him for years. A world that is frighteningly like our own...
The original idea was drastically different: "My first idea was to do something that capitalised on the world over-run with Silurians and dinosaurs, with no plastics available; a kind of post-holocaust situation. I had this idea for an opening sequence inspired by Aliens, with a UNIT squad decimated by shrieking raptors, and a group of medics dragging a mortally wounded Brigadier to safety while an officer screams: "Somebody get me a doctor!" And then you hear the TARDIS materialising, and the theme music kicks in." 
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.
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