The Doctor.
The Tenth Doctor is the tenth incarnation of the fictional character known as the Doctor seen on screen in the long-running BBC television science-fiction series Doctor Who. He is played by David Tennant, who replaced Christopher Eccleston's Ninth Doctor in the 2005 series finale, "The Parting of the Ways". Tennant has appeared in three series to date, as well as four seasonal specials. As with previous incarnations of the Doctor, the character has also appeared in other Doctor Who multimedia