Christopher Eccleston did a fantastic job as the Doctor in the new Doctor Who premiere last week. Now he's quitting.
Eccleston, whose first appearance as the ninth Time Lord attracted around 10 million viewers, feared being typecast.
Talks are taking place to replace him with Casanova star David Tennant.
A second series of the new Doctor Who, which will again be written by Russell T Davies and produced by BBC Wales, has already been commissioned.
Update: Nelson sez, "the rest of the series is already filmed. Ecclestone announced he was quitting after the first episode /aired/."