File:Tom Baker stars in John Lloyd's lost Doctor Who adventure, The Doomsday Contract

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It could be the end of the world as we know it in The Doomsday Contract, the lost Fourth Doctor adventure brought to life on audio by Big Finish.

Based on an initial 1979 story treatment developed by TV comedy producer John Lloyd for the television show’s seventeenth season, The Doomsday Contract is an adaption by comedy writer Nev Fountain.

This full-cast audio drama features the original lead actors, with Tom Baker, Lalla Ward and John Leeson reprising their roles as the Doctor, Romana and K-9. It tells the story of how the Doctor must take the stand to save the Earth – once again...

Earth - a small, insignificant planet. Entirely devoid of intelligent life.

At least that’s according to the legal documents. The Doctor, Romana and K9 find themselves at the centre of a most unusual trial.

An intergalactic corporation want to bulldoze the planet for a development project. Only a previous court’s preservation document is standing in their way. The Doctor has been summoned as an expert witness. If he can prove Earth contains intelligent life, the whole world will be saved.

But with a fortune at stake... it was never going to be that simple.

Writer Nev Fountain said: “This has been ten years or so in the making, yet it suddenly seems to have appeared from nowhere – like the Improbability Drive in The Hitchhiker’s Guide to the Galaxy! – and I was very excited to adapt it. Tom Baker is the Doctor I watched most in my childhood. I hadn’t written for Tom before so this was really exciting.”

“John Lloyd is a genius, he’s a comedy god, and there’s all of his great stuff there. And Douglas Adams’s notes are there in the margins. You’re working with Douglas as a script editor on John’s work – that’s just as exciting as writing for Tom Baker, Lalla Ward and John Leeson! It works on both levels for me, as a writer and a fan.”

Doctor Who – The Lost Stories: The Doomsday Contract is now available to own as a collector’s edition 2-disc box set or download from just £12.99, exclusively at the Big Finish website.

Big Finish listeners can save money by ordering a bundle of adventures from The Lost Stories range, including both Return of the Cybermen and The Doomsday Contract, from just £25.