The Catalyst (audio story)

Publisher's summary
The pride of the Z'nai matches that of Leela of the Sevateem. Why would the Doctor imprison one in such an unlikely place, and what terrors will be brought about by letting it loose?

Cast

 * Leela - Louise Jameson
 * H'mbrackle / The Z'nai - Timothy Watson

Continuity

 * Leela refers to the destruction of Gallifrey in the Last Great Time War. (TV: The End of the World) As such, it is one of the first Big Finish audio dramas to make direct reference to an event in the revival TV series.
 * Leela mentions being cast out from the Sevateem for blaspheming against Xoanon. (TV: The Face of Evil)
 * Leela recalls growing up with Tomas and Jabal and arguing numerous times with her father Sole during her childhood. (TV: The Face of Evil)
 * The Doctor once again observes, "Where there's life, there's hope." (TV: Planet of the Spiders)