Let me start out by saying I am an American, and like most Americans I am relatively new to the franchise; my first Doctor was the incredibly talented Matt Smith. In that case, believe me when I say had I watched the show when The Stolen Earth premiered, I would have been screaming at the television the moment that Dalek shot the Doctor in the back, causing him to regenerate into the following episode. The next week revealed that using the Doctors severed hand from The Christmas Invasion, kept within Torchwood Three by Captain Jack Harkness for reasons Im not sure I want to know, the Doctor used just enough regeneration energy to heal himself before redirecting the remaining energy into his hand, thus causing a biological meta-crisis (yes, its wibbly wobbly). This crisis would then lead to the forming of a human clone of the Doctor as well as copying the Doctors memories and abilities into Donna Noble. Once the Doctor saves the day (as always), his human clone spends the remainder of his days with Rose, and Donnas memory is blocked as to save her now part Time Lord mind from burning up. In the end, everybody gets what they want/need, but not the sad man with a box Okay, I know this isnt technically one of his regenerations, but it just proves how mad clever he is.