
Well, what those four knocks mean will be discovered when "Doctor Who" returns to BBC America on Dec. 26. The annual Christmas special, which for the first time ever will be shown in the United States with 36 hours from its original air in the United Kingdom, features the return of Donna Noble's grandfather, played by Bernard Cribbins.
Of course, we all know that this will be the final adventure of David Tennant as The Doctor, and it should definitely be something that will get us all worked up heading into the New Year's broadcast of the second part of "End of Time."
Get your first look at "Doctor Who: The End of Time, Part 1" right here, and then watch the whole episode Dec. 26 at 9 p.m. ET on BBC America.
The second part airs Jan. 1 on BBC in the United Kingdom and Jan. 2 on BBC America.
Clip courtesy of BBC America.
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Michael Hinman is the founder and site coordinator for Airlock Alpha and the entire BlipNetwork. He owns Quantum Global Media Inc., the parent corporation of the BlipNetwork. He's a print journalist by day, and lives in Tampa, Fla.