The Similarity Engine was the fourth and final story in the audio anthology Jago & Litefoot: Series One, produced by Big Finish Productions. It was written by Andy Lane and featured Christopher Benjamin as Henry Gordon Jago and Trevor Baxter as George Litefoot.
When Jago takes a tumble on an unseasonably icy road, he ends up in hospital. But this is no ordinary medical establishment, and the patients are suffering from no ordinary illnesses. At last, the fiendish scheme of Dr Tulp is drawing to its cataclysmic climax. The Similarity Engine is operational. And a new, improved model of mahogany murderers have been unleashed...
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- Henry Gordon Jago - Christopher Benjamin
- George Litefoot - Trevor Baxter
- Ellie Higson - Lisa Bowerman
- Sergeant Quick - Conrad Asquith
- Doctor Tulp - Toby Longworth
- Smitty - Matt Steer
- Sergeant Lange/Ragamuffin - Alex Lowe
- Constable Lee - John Banks
- Alf - Alex Mallinson
- Gabriel Sanders - David Collings
- Dr Tulp tells Jago and Litefoot that there will be wars which will span the entire world in the 20th century.
- The story ends on a cliffhanger, leading into the next season's first story, Litefoot and Sanders — in fact, the last words spoken are "Litefoot and Sanders."
- Jago refers to his work at the Palace Theatre. (TV: The Talons of Weng-Chiang)
- Litefoot reminds Jago that they have encountered people who seemed to rise from the grave. (AUDIO: The Bellova Devil)
- Litefoot refers to his time in China. (TV: The Talons of Weng-Chiang)
- Dr. Tulp recalls his first encounter with Jago and Litefoot. (AUDIO: The Mahogany Murderers)
- Jago tells Dr. Tulp that he has seen a machine that came back from the future and met the man who was mutated by travelling in it. (TV: The Talons of Weng-Chiang)
- Jago realises that Dr. Tulp is the other medium of whom Toby Barker spoke at Mrs Vanguard's house. (AUDIO: The Spirit Trap)
- The Similarity Engine was funded by the late members of The Far-Off Travellers Club. (AUDIO: The Bellova Devil)
- Private Michaels previously noted it was strange for Tulp to examine a patient whilst still wearing his gloves. (AUDIO: The Bloodless Soldier)