From TARDIS Index File, the free Doctor Who reference.

This article is written from the Real World point of view.

Kaldor City was a series of audio dramas produced by Magic Bullet Productions, based upon characters and a locale featured in DW: The Robots of Death and PDA: Corpse Marker.

Of these dramas The Prisoner was a twenty minute play from Magic Bullet Productions released as part of an MJTV Productions CD, The Actor Speaks: Paul Darrow, which featured an interview and several short stories unrelated to Kaldor City.

Audio Dramas (MB)

Occam's Razor	Death's Head	Hidden Persuaders	Taren Capel
Checkmate	Storm Mine	The Prisoner