CARMEN: Doctor? You take care now.
DOCTOR: You too. Chops and gravy, lovely.
CARMEN: No, but you be careful. Because your song is ending, sir.
DOCTOR: What do you mean?
CARMEN: It is returning. It is returning through the dark. And then, Doctor? Oh, but then he will knock four times.
David Tennant and Michelle Ryan and a Double Decker Bus head off into another dimension where a deadly swarm awaits them. It's the Easter Special and the begining of the end for the 10th Doctor in Planet of the Dead.
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