What Lies Beneath (documentary)

 was a DVD documentary that was released on 14 January 2008.

Booklet synopsis
A documentary showing how the socio-political climate of the late 1960s helped shape this Doctor Who story. Featuring director Timothy Combe, producer Barry Letts, script editor Terrance Dicks, actors Caroline John, Nicholas Courtney and Peter Miles, new series writer Paul Cornell and former MP Roy Hattersley. Narrated by Geoffrey Palmer.

People interviewed

 * Barry Letts, Producer
 * Timothy Combe, Director
 * Terrance Dicks, Script Editor
 * Caroline John, Liz Shaw
 * Peter Miles, Dr Lawrence
 * Roy Hattersley, Labour MP 1964-1997
 * Nicholas Courtney, The Brigadier
 * Paul Cornell, New Series Writer

Crew

 * Written by - David Harley
 * Narrator - Geoffrey Palmer
 * Featuring - Timothy Combe, Paul Cornell, Nicholas Courtney, Terrance Dicks, Roy Hattersley, Caroline John, Barry Letts, Peter Miles
 * Boy - William Harley
 * Camera - Richard Molesworth
 * Colourist - Jonathan Wood
 * With thanks to - Peter Crocker, Derek Handley, Paul Vanezis, Heights of Abraham, Matlock Bath, Derbyshire
 * Executive Producer - Dan Hall
 * Produced and Directed by - Steve Broster
 * © 2008 2|entertain