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Criss-Cross was the two hundred and fourth story in Big Finish's monthly range. It was written by Matt Fitton and featured Colin Baker as the Sixth Doctor and formally introduced Miranda Raison as the new companion Constance Clarke.

Constance had previously appeared in The Sixth Doctor: The Last Adventure due to its earlier than previously scheduled release. This was meant to be Constance's audio debut.

Publisher's summary[]

Bletchley Park. Britain's most secret weapon in the Second World War.

Inside draughty huts, the earliest computers clatter day and night, decoding enemy transmissions and revealing intelligence crucial to the country's defence. Leading WREN Mrs Constance Clarke directs her charges to provide vital assistance to the boffins stationed in the Manor House. But a recent arrival among the code-breakers, the mysterious Dr Smith, has attracted the attention of MI5's spycatchers...

Over in mainland Europe, Nazi agents are briefed, covert operations planned, and a German submarine embarks on a very secret mission.

As encrypted radio waves criss-cross the planet, unearthly forces stir. And when certain cyphers are cracked, something will emerge to threaten all humanity, regardless of allegiance...

Until now...


Part one[]

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Part two[]

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Part three[]

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Part four[]

to be added




  • This story was recorded at The Moat Studios.
  • On the cover, The Doctor is shown wearing a new costume comprising of a Bletchley tweed, a dark waistcoat, blue shirt and a bow-tie. He would wear it again on the cover of Quicksilver.
  • Subscriptions that included this story also included the audio short story The Warren Legacy.
  • According to the extras, the script to The End of the Line, the first story in which Constance appeared, was written prior to Criss-Cross even though this story was intended to be released before it.


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