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Some of the plot elements of Business Unusual (the Pale Man and the Irish twins Ciara and Cellian) form part of a trilogy of novels which began in Gary Russell's Virgin Missing Adventures novel The Scales of Injustice and concluded in his PDA Instruments of Darkness.
Brake followed Escape Velocity with the Past Doctor Adventure The Colony of Lies in July 2003, and then with the audio adventure Three's a Crowd from Big Finish Productions in 2005.
Kaldor City is a human city of the future on an unspecified alien world, created by Chris Boucher for the Doctor Who serial The Robots of Death broadcast in 1977, and reused in his Past Doctor Adventure Corpse Marker in 1999.
The BBC Books Past Doctor Adventures novel The Eleventh Tiger by David A. McIntee features an energy helix that is strongly implied to be the same one featured in The Masque of Mandragora.
Dodo also appears in the Past Doctor Adventures novel Bunker Soldiers, four short stories in the Virgin Decalog and BBC Short Trips, and the Big Finish Productions audio dramas Mother Russia, Tales from the Vault, and Return of the Rocket Men.