As part of a well-deserved holiday, the Doctor takes a tour on the planet called Midnight. Little does he know that something is knocking on the walls, although the planet shouldn't be inhabited.Soon the passengers begin to panic when one gets possessed.



Watch Now

With Prime Video





Episode complete credited cast:
Ayesha Antoine ...
Lindsey Coulson ...
Tony Bluto ...
Driver Joe


The Doctor and Donna are taking a bit of a break from their adventures and spending a bit of time on the planet Midnight. While Donna opts to spend a bit of time in the spa, the Doctor goes off on an all-day bus tour to the Sapphire Waterfall. Part way through the four hour journey to get there, the vehicle stops for no apparent reason. When they hear noise coming from outside the vehicle, panic begins to set in. When one of the passengers is taken over by the being, the passengers paranoia and fear know no bounds and the focus of their solution is to eliminate the Doctor. Written by garykmcd

Plot Summary | Plot Synopsis

Parents Guide:



Release Date:

11 July 2008 (USA)  »

Company Credits

Production Co:

Show detailed on  »

Technical Specs


(50 episodes)

Sound Mix:

(Dolby 5.1)
See  »

Did You Know?


The first time on the show someone mentions "He will knock 4 times." See more »


When the Doctor is talking Donna just before boarding the Crusader bus, a green screen can be seen behind him. See more »


The Doctor: Why are you repeating?
Sky Silvestry: Why are you repeating?
The Doctor: What is that, learning?
Sky Silvestry: What is that, learning?
The Doctor: Copying?
Sky Silvestry: Copying?
The Doctor: Absorbing?
Sky Silvestry: Absorbing?
The Doctor: The square root of pi is 1.7...
Sky Silvestry: [talking over] The square root of pi is...
See more »


Featured in Doctor Who Confidential: End of an Era (2008) See more »


Doctor Who Theme
Written by Ron Grainer
Arranged by Murray Gold
Performed by BBC National Orchestra of Wales
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

One of the best!
15 December 2009 | by (United Kingdom) – See all my reviews

Seriously, ignore carrotjuicer3000's review. This is one of the best episodes of season 4, maybe of the whole series. It's suspenseful, its well written, its just....eerie. Just because its a standalone episode doesn't mean its not just as good as others. And not every episode needs comic relief, specially not one like this. So Tate is not missed. She gets the next few episodes focused on her anyways.

Lesley Sharp is fantastic in her role, marvellously creepy... Tennant is brilliant as always. The supporting cast is fantastic too, which includes Colin Morgan(Merlin).

Once you start watching this episode, you literally can't stop. Every time I've seen it repeated on BBC3, and skipped over the channel, at any point during the episode, I'd have to continue watching. Who'd a thunk an episode set in one room would be so brilliant? It's simply....molto bene.

18 of 20 people found this review helpful.  Was this review helpful to you?

Contribute to This Page

Create a character page for: