Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.



audio stub

The Crowmarsh Experiment was the second story in the seventh series of The Fourth Doctor Adventures, produced by Big Finish Productions. It was written by David Llewellyn and featured Tom Baker as the Fourth Doctor and Louise Jameson as Leela.

Publisher's summary[]

When attacked on an alien world, Leela falls unconscious... only to wake in another time, another place.

She is in the Crowmarsh Institute on Earth, in London, in 1978, and everyone is calling her Doctor Marshall. They tell her the world she has known is but a fantasy, a delusion, and that this place is the one that is real.

Surrounded by familiar faces on unfamiliar people, Leela knows what is true and what is false. But how long can she believe when everyone around her says it’s a dream? What’s really happening here?


Part one[]

to be added

Part two[]

to be added




Alternate cover

  • The week this story is set was also the week of Leela's departure from the show and the week David Llewellyn was born.
  • Llewellyn was given a very open brief, with the main stipulation simply being that the story feature the Fourth Doctor and Leela. (BFX: The Crowmarsh Experiments)
  • Colin Marshall, Linus Strang and Dr Holman are all versions of characters that previously appeared in The Fourth Doctor Adventures. Llewellyn decided their inclusion would help provide more emotional weight to the story, and also tie it closer to the existing continuity. (BFX: The Crowmarsh Experiments)
  • The story follows similar themes about alternate dream realities to Amy's Choice in Series 5 of the TV series.


External links[]