- 1999: Portrays Romolo in the made-for-CD audio dramatization of the novel "Dragons' Wrath", part of Big Finish Productions' Adventures of Bernice Summerfield series, an audio spin-off of "Doctor Who" (1963) on which Franklin co-starred in the 1970s.
- Wrote the novel The Killing Stone, which continues the story of Mike Yates after the time seen in Doctor Who. This novel has never been published and is only available as a spoken word CD, narrated by Franklin. The novel was originally a one-man play, which Franklin performed in fringe theatres in Britain.
- Wrote and directed the stage production Recall: U.N.I.T or The Great T. Bag Mystery, in which he also played Mike Yates once again.
- (2005) Provided a commentary for the Doctor Who (1963) DVD "The Claws of Axos".
- (2011) Provided a commentary for the Doctor Who (1963) DVD "Invasion of the Dinosaurs".
- (2012) Provided a commentary for the Doctor Who (1963) DVD "The Dæmons".
- (2011) Provided a commentary for the Doctor Who (1963) DVD "Planet of the Spiders".
- (2013) Provided a commentary on The Green Death: Episode Four (1973) and The Green Death: Episode Five (1973) for the Special Edition DVD release of the story.