The Quest of the Engineer (audio story)

 was the fourth story in the ninth series of The Fourth Doctor Adventures, produced by Big Finish Productions. It was written by Andrew Smith and featured Tom Baker as the Fourth Doctor, Lalla Ward as Romana II, Matthew Waterhouse as Adric and John Leeson as K9 Mark II.

Publisher's summary
The TARDIS crew's attempts to escape E-Space lead them to a strange planet with a surface that shifts and changes constantly.

Losing their ship down a fissure, they venture into the depths of this world and encounter the man who rules this place – a man known only as 'the Engineer'. He tells them that he’s on a quest for illumination, and to find a rumoured portal in space that may lead to another reality, with knowledge unknown in this universe.

It seems he may be on the same quest as the Doctor and his friends. But can he be trusted? And who is he really?

Part one
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Part two
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Part three
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Part four
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Cast

 * The Doctor - Tom Baker
 * Romana - Lalla Ward
 * Adric - Matthew Waterhouse
 * K9 - John Leeson
 * Jonas - Timothy Blore
 * The Enforcers / Captain of the Guard - Richard Hansell
 * Regis Tel - George Layton
 * The Engineer - Nicholas Woodeson
 * Anla Jessik - Sarah Woodward

Crew

 * Cover Art - Anthony Lamb
 * Director - Nicholas Briggs
 * Executive Producers - Jason Haigh-Ellery and Nicholas Briggs
 * Music and Sound Design - Jamie Robertson
 * Producer - David Richardson
 * Script Editor - John Dorney
 * Writer - Andrew Smith

Worldbuilding
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Continuity
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