- (1998) Portrays Ninan-ashtammu in the made-for-CD audio dramatization of the novel "Walking to Babylon", part of Big Finish Productions' Adventures of Bernice Summerfield series, an audio spin-off of "Doctor Who" (1963) on which Sladen co-starred in the 1970s.
- (2002) Ms. Sladen played the role of "Sarah Jane Smith" (a role she originated on the television series "Doctor Who") in a series of Audio-Book Compact Discs produced by Big Finish in conjunction with the BBC. The first adventure, "Comeback", is available now (with more to follow soon).
- (1976) Played Sarah Jane Smith in an educational BBC Schools programme on Radio 4, "Exploration Earth".
- (1976) Played Sarah Jane Smith in Argo/Decca Records' LP release "Doctor Who and the Pescatons".
- (August 27, 1993 - September 24, 1993) Played Sarah Jane Smith in the BBC Radio 5 serial "Doctor Who: The Paradise of Death".
- (January 21, 1996 - February 24, 1996) Played Sarah Jane Smith in the BBC Radio 2 serial "Doctor Who: The Ghosts of N-Space".
- (2002) Provided a commentary for the Doctor Who DVD "The Ark in Space".
- (2004) Provided a commentary for the Doctor Who DVD "Pyramids of Mars".
- (2007) Provided a commentary for the Doctor Who DVD "Genesis of the Daleks".
- (2006) Provided a commentary for the Doctor Who DVD "The Hand of Fear".
- (2006) Provided a commentary for the Doctor Who DVD "The Sontaran Experiment".
- (2007) Provided a commentary for the Doctor Who DVD "Robot".
- (2008) Provided a commentary for the Doctor Who DVD "The Time Warrior".
- (2007) Provided a commentary for the Doctor Who DVD "Planet of Evil".
- (1987) TV commercial for the Rover 800 car "Horse Racing"
- (2008) Provided a commentary for the Doctor Who DVD "The Brain of Morbius".
- (2008) Provided a commentary for the Doctor Who DVD "The Five Doctors" (25th Anniversary Edition).
- (September 1963) She acted in the National Youth Theatre Production of William Shakespeare's play, "Hamlet", at the Scala Theatre in London, England with Simon Ward (as "Hamlet"), Jeremy Rowe, Giles Block, Neil Stacy, Michael Cadman, Hywel Bennett, Bill Kenwright CBE (as "1st sailor"), Nigel Terry and Dame Helen Mirren in the cast. Michael Croft was the director.
- (2010) Provided a commentary for the Doctor Who DVD "Revenge of the Cybermen".
- (1970) She acted in Christopher Hampton's play, "The Philanthropist", at the Mayfair Theatre in London, England with George Cole, Edward de Souza, Andrew Neil, Annabel Leventon, William Job, and Pamela Moiseiwitsch in the cast. Robert Kidd was the director.
- (2011) Provided a commentary for the Doctor Who DVD "Planet of the Spiders".
- (1990) played 'mum' in a Vosene shampoo TV commercial
- (1996) Storyteller on BBC Schools unit "Watch: Places of Worship - Christianity".
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