The David Tennant Treat 4 Today is a short clip of David Tennant from The Quatermass Experiment which was a 2005 live television film remake of the 1953 television series of the same name.
It was during the rehearsals for The Quatermass Experiment that David Tennant was offered the role of the Tenth Doctor in Doctor Who. This casting was not announced to the public until later in April but his fellow cast members, and crew became aware of the speculation surrounding Tennant so in the live broadcast Jason Flemyng changed Quatermass's first line to David's Doctor Briscoe character from "Good to have you back Gordon" to "Good to have you back Doctor" as a deliberate reference.
Apologies if the video does not play in your country.
