|Big Finish Productions audio drama|
|Range||Eighth Doctor Adventures|
|Written by||Nicholas Briggs|
|Directed by||Nicholas Briggs|
|Produced by||Jamie Robertson - Music & Sfx|
|Executive producer(s)||Nicholas Briggs|
|Length||2x 30-minute episodes|
|Release date||30 June 2009|
Human colonists in the future face many battles to survive. But few as costly as the threat of the Wirrn.
- The Doctor — Paul McGann
- Lucie Miller — Sheridan Smith
- Salway — Colin Salmon
- Delong — Daniel Anthony
- Farroll — Liz Sutherland
- Winslet — Ian Brooker
- Queen — Beth Chalmers
Production and casting
- Daniel Anthony appears as Clyde Langer in spin-off The Sarah Jane Adventures opposite Elisabeth Sladen
- Colin Salmon previously played Doctor Moon in Silence in the Library and Forest of the Dead
- Jamie Robertson who produced the sound design for Dalek Empire: The Fearless and scored the music for the Key 2 Time series has the Job of Bringing back the Wirrn with a new Sound design but has promised to Keep a distinctive wirrn sound but updated to keep it with a more modern sfx design.
- The Wirrn have also appeared in the TV story The Ark in Space and the novel Placebo Effect.
- They have also appeared in one other Big Finish audio, Wirrn Isle.
- Lucie mentions her centipede friend, referencing Rosto in Sisters of the Flame.