How Every Doctor Who Got Cast

David Tennant has always cited Doctor Who as one of the key influences on his decision to become an actor. In fact, Tennant had played multiple roles in Big Finish audio dramas in the years before he was cast as Doctor number Ten.

Alongside these audio dramas, Tennant's TV career was taking off with a breakthrough role in 2004's Blackpool, opposite "the next Doctor" David Morrissey. Tennant also got the chance to work with Russell T Davies on the 2005 show Casanova, which is what led to his casting as the Tenth Doctor.

When Christopher Eccleston decided not to return for Doctor Who Series 2, RTD had to find a replacement fairly quickly. So it was a good job that he'd literally just worked with an incredibly talented actor, who had also been dreaming of playing the Doctor since he was a little kid in Paisley.

Not wishing for their new lead to leave as quickly as Eccleston had, the BBC signed Tennant for multiple series. Not that he would've minded, the man can't keep away!