Doctor Who (1963–1989)
4 user 1 critic

The Invasion: Episode Four 

The Doctor and Jamie enlist the help of UNIT to rescue Zoe and Isobel before trying to find out what Vaughn is really up to.


Douglas Camfield


Derrick Sherwin, Kit Pedler (from a story by)


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Episode cast overview:
Patrick Troughton ... Dr. Who
Frazer Hines ... Jamie
Wendy Padbury ... Zoe
Sally Faulkner Sally Faulkner ... Isobel
Kevin Stoney ... Tobias Vaughn
Peter Halliday ... Packer
Robert Sidaway Robert Sidaway ... Captain Jimmy Turner
James Thornhill James Thornhill ... Sergeant Walters
Nicholas Courtney ... Brigadier Lethbridge-Stewart
Sheila Dunn Sheila Dunn ... Telephone Operator (voice)
Edward Burnham ... Professor Watkins
Edward Dentith ... Major-General Rutlidge
Pat Gorman ... Cyberman


The Doctor and Jamie enlist the help of UNIT to rescue Zoe and Isobel before trying to find out what Vaughn is really up to.

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TV-G | See all certifications »

Did You Know?


This episode was watched by 6.4 million viewers on its original transmission. See more »


Zoe States they saw a space ship on the other side of the moon when they didn't this was corrected in the animated reconstruction. See more »


Referenced in Evolution of the Invasion (2006) See more »

User Reviews

Some big moments in this episode.
17 October 2019 | by Sleepin_DragonSee all my reviews

Fortunately the Brigadier had given The Doctor the communication device, it comes in very handy.

As with the first episode, this one is sadly missing, a real shame as this is one of the best episodes of Invasion, it has some key moments, a helicopter escape and of course the big reveal.

It's telling that we are exactly half way through, and only now we've had the big reveal. Up until this point the story has been baffling and intriguing enough to not need the big alien threat. The story changes beyond this point.

If only this one would be found one day, I would love to see how the helicopter rescue scene was realised, it's a big moment, tough to have produced I would have thought.

Very, very good. 9/10

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Release Date:

23 November 1968 (UK) See more »

Company Credits

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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