Doctor Who: 20 Things You Didn't Know About The Tenth Doctor

20. Tennant's Casting Was Hinted At In A Movie

On 16 April 2005 - less than a month after Doctor Who returned to TV after a lengthy hiatus - it was announced that David Tennant would be replacing Christopher Eccleston as the Doctor.

However, the announcement of his casting was very nearly spoiled in the most random of places.

When he was told he got the part, Tennant was rehearsing for a live TV movie version of The Quatermass Experiment, in which he played a character named Dr. Gordon Briscoe.

His fellow castmates clearly knew something was up, because lead actor Jason Flemyng dropped a major hint during the broadcast.

He changed his opening line to Tennant's character from "Good to have you back, Gordon" to "Good to have you back, Doctor".

Cheeky.