Sean Pertwee
From Tardis Wiki, the free Doctor Who reference
Sean Pertwee was a British actor who appeared as himself in the 50th Anniversary story The Five(ish) Doctors Reboot.
Sean Pertwee is also the son of Third Doctor actor, Jon Pertwee. He was asked many times wheter or not he would play the role of the Third Doctor is asked (as a tribute to his father), but Sean has said that the character was his father's and that he wants to keep it that way.