Doc Martin (2004– )
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The Portwenn Effect 

The doctor pays a visit to the forester, who apparently shares his shack with a giant squirrel. Little Peter Cronk gets into trouble over some nest boxes.


Ben Bolt


Dominic Minghella (written & created by)

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Episode cast overview, first billed only:
Martin Clunes ... Dr. Martin Ellingham
Caroline Catz ... Louisa Glasson
Stewart Wright ... PC Mark Mylow
Ben Miller ... Stewart James
Joe Absolom ... Al Large
Stephanie Cole ... Joan Norton
Lucy Punch ... Elaine Denham
Ian McNeice ... Bert Large
Mary Woodvine Mary Woodvine ... Mrs. Cronk
Kurtis O'Brien Kurtis O'Brien ... Peter Cronk
Bill Thomas Bill Thomas ... Robin Thornton
Isabelle Barker Isabelle Barker ... Mrs. Potter
Brian Abbott Brian Abbott ... Headmaster
T.J. Holmes T.J. Holmes ... Rundle (as TJ Holmes)
Carol MacReady ... Mrs. Beckett


With the the Portwenn Players annual dance coming up, Louisa tries to interest Martin in attending, but when he turns her down she gives her extra ticket to Mark Mylow who immediately misunderstands and thinks they now have a date. When Martin hears about it, he too misunderstands. Martin visits Stewart James, a recluse who thinks he lives with Anthony, a giant 6-foot squirrel. Martin wants to have him sectioned, but reconsiders following a subsequent visit. Young Peter Cronk gets into trouble when he's accused of destroying bird houses and feeders in various back gardens and runs away. Written by garykmcd

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Comedy | Drama | Romance








Release Date:

23 September 2004 (UK) See more »

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Sound Mix:




Aspect Ratio:

16:9 HD
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Did You Know?


This episode marks the first appearance of Peter Cronk, played by Kurtis O'Brien. In season seven the character is played by Preston Nyman. See more »


Doc Martin is offered the use of a green pick-up as a courtesy car while his is fixed by the mechanic. Moments later however, he can be seen driving a cream coloured pickup. See more »


Stewart James: Magicians, these chemists.
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Written by Donna Johnson, Robert Kool Bell, Ronald Bell, George Funky Brown, Eumir Deodato, Robert Spike Mickens, Claydes Smith, J.T. Taylor, Dennis D.T. Thomas and Earl Toon
played at the dance
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User Reviews

The Other
10 January 2018 | by HitchcocSee all my reviews

This episode focuses in on those that are dismissed out of hand. We have a precocious young boy who is probably on the autism spectrum. He is blamed for things because of his proximity and his lack of social graces. The policeman who suffers from depression and a great need to be loved and an inability to trust. There is a forester who was in combat in Bosnia and who thinks he is visited by a giant red squirrel. They are all worthy characters who must battle preconceptions. The Doc begins by making judgments himself but gets a lesson. He is bound by his Hippocratic oath which doesn't always apply when it comes to this little village.

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