As well as playing companion Edward Bradley and recurring villain Tor Garane in the Planet Skaro Audios (Season 2 onwards), Martin Penny has also written the stories The Paradise Machine, A Baron For All Seasons and Blood Money, which comprise an arc set in the future.
He has played the following parts in the Planet Skaro Audios:
- Edward Bradley in Heart of the Haniad, Heist!, The Hand of Peace and Wealth of Craytians
- Tor Garane in The Paradise Machine, A Baron For All Seasons and Blood Money
- Liam Hansen in Echoes of the Protii
- Roddy Stevens in Soap of Fatal Death
- Freddie Mercury/Peg Leg Pete in Magical History Tour
- Killraxxian in A Baron For All Seasons