THE end of an era for Doctor Who approached on a screen in central London today.

“It’s been something that I’ll be forever proud of,” David Tennant told us afterwards.

“Filming the very, very final scenes was very sad.”

The Waters Of Mars is as dark and as thrilling an episode of Doctor Who as any I’ve ever seen.

It’s the second of four farewell specials starring David as the tenth Time Lord.

And it foreshadows his departure in a final two-part story to be screened at Christmas.

The hour-long episode, premiered at the press launch today, will be broadcast on BBC1 at 7pm on Sunday Nov 15.

There’s a full transcript below of this morning’s post-screening Q&A with David and outgoing Doctor Who showrunner Russell T Davies.

But first a little background.