The Natural History of Fear (audio story)

 was the fifty-fourth monthly Doctor Who audio story produced by Big Finish Productions. It featured Paul McGann, India Fisher and Conrad Westmaas.

Publisher's summary
IT IS A CRIMINAL OFFENCE TO COPY OR ATTEMPT TO COPY ANY PERSONALITY OR MEMORY-RELATED ARTICLE SHOWN OR DISPLAYED IN THIS PUBLIC THEATRE, INCLUDING THIS WARNING. PUNISHMENT OR CONVICTION IS AN UNLIMITED REDUCTION OF AUTHORISED OVERTIME HOURS AND TOTAL PERSONALITY REVISION. YOU ARE NOT PERMITTED TO BRING ANY JUKEBOX OR RECORDING EQUIPMENT INTO THIS PUBLIC THEATRE. THIS WILL BE TREATED AS AN ATTEMPT TO BREACH COPYRIGHT. ANY PERSON DOING SO CAN BE EJECTED AND THE EDITOR MAY CONFISCATE SUCH ARTICLES. WE ASK THE PUBLIC TO BE VIGILANT AGAINST ANY SUCH ACTIVITY AND REPORT ANY MATTERS AROUSING SUSPICION TO THEIR LOCAL CONSCIENCE. THANK YOU.

Public Warning

Faction Against Character Theft

Cast
This audio deals with amnesia. Accordingly, characters' names are generally not given in the narrative. Titles are substituted. The cast list, both on the official website and on the liner notes, attempts to extend the confusion by merely listing the names of the actors, without giving the characters' names.
 * Paul McGann
 * India Fisher
 * Conrad Westmaas
 * Geoff Searle
 * Alison Sterling
 * Sean Carlsen
 * Wink Taylor
 * Jane Hills
 * Ben Summers

Continuity

 * The Doctor previously referred to the Censor shortly after he and Charley entered the Divergent Universe in AUDIO: Scherzo, though paradoxically he did not know who he was at the time.