to be added
- Agnes Landen - Maureen O'Brien
- Lt Carlisle - John Schwab
- Salus Kade - Noel Clarke
- Dr Mezeran - Jane Goddard
- Lajitta - Ginita Jimenez
- Announcer / Computer / PA - Sean Connolly
- Ernst Tanlee - David Sax
- Officer - Ian Brooker
- Spacer 1 - Andrew Dickens
- The Daleks - Nicholas Briggs
- David Sax (Tanlee) is a pseudonym for Nicholas Briggs (The Daleks).
- This audio drama was recorded on 16, 17, 18, 23 and 24 July 2007.
- This is the only audio drama in the Dalek Empire series not to feature Susan Mendes.
- This audio drama features an extended remix of the Dalek Empire theme tune. This remix was introduced in the audio story The Future.
- This story occurs one month before the audio story Project Infinity.
- Kade tells the Dalek Emperor that Susan Mendes and Kalendorf are plotting a galaxy wide revolt against the Daleks. (AUDIO: The Human Factor, Return of the Daleks, "Death to the Daleks!")
- Official The Fearless: Part 4 page at bigfinish.com
- Jamie Robertson (Music Composer and Sound Design)