Doctor Who: Season 12, Episode 5

The Ark in Space: Part One (25 Jan. 1975)

TV Episode  -   -  Adventure | Drama | Sci-Fi
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Ratings: 8.3/10 from 259 users  
Reviews: 5 user | 8 critic

The Doctor's attempt to give Harry a trip in the TARDIS sees the two of them and Sarah arriving onboard a space station in the far future, with some rather deadly security mechanisms.



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Title: The Ark in Space: Part One (25 Jan 1975)

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Episode complete credited cast:
Ian Marter ...
Gladys Spencer ...
High Minister (voice)
Peter Tuddenham ...
Computer (voice)


The Doctor's attempt to give Harry a trip in the TARDIS sees the two of them and Sarah arriving onboard a space station in the far future, with some rather deadly security mechanisms.

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Release Date:

25 January 1975 (UK)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


John Lucarotti's version concerned a massive space ark carrying cryogenically-frozen humans, which has been invaded by the Delc. The Delc are fungi, grown from spores floating in space. The primary Delc take the form of floating heads, while their servitors appear as headless bodies. The Delc are impervious to most harm because any impact just causes the release of more spores. Fortunately, the Doctor eventually discovers that the Delc are susceptible to electrocution, and ultimately knocks the primary Delc out into space with a golf club. See more »


When the Doctor and Harry first discover the room full of cryogenically frozen humans, there is a point where the two of them are talking and, from over Harry's shoulder, you can see one of the "frozen" humans opening and closing his eyes. See more »


Harry Sullivan: She's coming round. Steady, steady on, old girl, steady on.
Sarah Jane Smith: [dazed] Harry?
Harry Sullivan: Yes, I'm here, I'm here.
Sarah Jane Smith: Call me old girl again... and I'll spit in your eye.
See more »

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User Reviews

Ark lark
20 June 2014 | by (United Kingdom) – See all my reviews

As a kid in the 70's, I never watched any of Tom Baker's Dr Who adventures. Partly it was a reaction to losing "my Doctor", Jon Pertwee, a great favourite of mine, but more likely, I'd probably outgrown the show. Now with previous episodes like this available, I decided to break my taboo and tune in for the first time on the fourth doctor, understanding that this was considered one of his best-remembered outings.

Immediately I watched, I was taken back to my childhood remembrances of the show, bad and good. In the former category, you get the rubbish special effects (I thought the use of models depicting spaceships went out with Gerry Anderson and as for the big green sock meant to portray the Wirrn monster...?!?), grating incidental music in the background, the awful Sarah Jane Smith crying "Doc-tah, Doc-tah" any chance she gets and with a ridiculous display of facial movements unfortunately shown in close up). On the positive side, there are the actually pretty good set design, a reasonably interesting and involving story and of course Tom Baker as the Doctor himself. He's the only one in the whole cast you can't see acting and he plays the whole thing with a twinkle in his eye and with consummate ease.

I will look out for other Baker-led adventures of our favourite Gallifreyan even though he'll never better Pertwee or Patrick Troughton as my favourite incarnation of the Time Lord.

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