Sylvester McCoy
The seventh Doctor began without his memory, thanks to a plot by the Rani, in the season twenty-four story Time and the Rani. The Doctor started his new regeneration as a spoon-playing, malapropism-spouting clown. It was not until season twenty-five that McCoy began to really get a handle on the new Doctor's character, playing him as a darker and more manipulative Timelord than his predecessors generally were.
Paul McGann
The eighth Doctor who appeared in the Fox TV-Movie, he regenerated inthe mean streets of San Fransico making this one of the most exciting plots.