Q: why cant i find a video of the 8th doctor regenerating into the 9th? ive searched youtube all over, and every one has made their diferent versions of the regeneration, but i want to know what really happened!
A: i believe that's because the old series ended with the 8th doctor. it was left for several years and then the BBC commissioned a new series. obviously the 8th doctor couldn't continue because he would have aged, thus betraying the idea that the doctor doesn't age. so they cast christopher ecclestone as the ninth doctor, not explaining how he regenerated. he was the doctor for one series, and then david tennant took over and is the current doctor. so you'll have to just imagine what really happened i'm afraid =]