The Catalyst (Doctor Who audio)

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The Catalyst
Album cover
Big Finish Productions audio drama
Series 'Doctor Who'
Release no. 8
Featuring Leela
Written by Nigel Fairs
Directed by Nigel Fairs
Production code BFPDWCC08
Length 60 mins
Release date January 2008

The Catalyst is a Big Finish Productions audiobook based on the long-running British science fiction television series Doctor Who.

The Companion Chronicles "talking books" are each narrated by one of the Doctor's companions and feature a second, guest-star voice along with music and sound effects. Louise Jameson reprises her role as Leela.


Leela encounters an alien Z'nai imprisoned by a former incarnation of the Doctor.



  • This is the first story to explain what happened to Leela after the events of the Gallifrey series. It also seems to show that she survived the Time War. Her story continues in Empathy Games and concludes in The Time Vampire.
  • Joshua Douglas' adventure with the Z'nai and the Doctor is glimpsed in The Time Vampire. He seems to be with the Third Doctor, a man with white hair and a bright red jacket.

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