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Rat Trap was the one hundred and forty-eighth story in Big Finish's monthly range. It was written by Tony Lee and featured Peter Davison as the Fifth Doctor, Sarah Sutton as Nyssa, Janet Fielding as Tegan Jovanka and Mark Strickson as Turlough.

Released in June 2011, it was the final story in the 2011 Fifth Doctor trilogy featuring Tegan, Turlough and an older Nyssa.

Publisher's summary[]

1983: as the country goes to the polls, two "Urban Explorers", together with a freelance journalist, break into the long-defunct Cadogan Tunnels, once a secret wartime facility... and later, so rumour has it, the site of an experimental laboratory with a nasty sideline in vivisection.

What they find, in its twisting underground corridors, is something the most cynical conspiracy theorist could never have imagined: a highly-evolved society of questing, intelligent creatures, living right under humanity's nose for decades.

But there's no way out of the tunnels — as the Doctor, Nyssa, Tegan and Turlough are about to discover when the TARDIS brings them, too, into the complex. It's a rat trap — and they've all been caught!


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  • The Doctor tells Nyssa that UNIT will clean up after him, and tells Kevin he'll contact them in order to see if he could join up.



  • Turlough refers to the State of Grace in the TARDIS and how it will prevent weapons fire but not general damage.



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