The protagonist of the British sci-fi show Doctor Who changes because the Doctor can regenerate his body, therefore altering his physical appearance and personality. When this happens, a new actor assumes the role. The Tenth Doctor is one of the many incarnations of the Doctor. Played by actor David Tennant in three series and several specials, The Tenth Doctor is charming, likable, easygoing and charismatic. Get the Doctor Who 10th Doctor #221 POP! Bobblehead, for sale here.