Ian Don Marter was born at Alcock Hospital in Keresley, near Coventry, on the 28th of October 1944. His father, Donald Herbert, was an RAF sergeant and electrician by trade, and his mother was Helen, nee Donaldson. He was, among other things, a teacher and a milkman. He became an actor after graduating from Oxford University, and appeared in Repertory and West End productions and on television. He trained at the Bristol Old Vic. He was best known for playing Harry Sullivan in the BBC Television series Doctor Who from 1974 to 1975, alongside Tom Baker and Elisabeth Sladen. He had already appeared in the show as Lieutenant John Andrews in the Jon Pertwee serial Carnival of Monsters. He had numerous TV roles including appearances in Crown Court and Bergerac (Return of the Ice Maiden, 1985, opposite Louise Jameson). Marter got into writing the novelisations following a dinner conversation. He went on to adapt 9 scripts over ten years. He started with The Ark in Space, the TV version of which he'd actually appeared in as companion Harry Sullivan. In the end he adapted more serials than he appeared in (7 appearances, 9 novelisations), and wrote one of the Companions series, telling of the post-Doctor adventures of Harry in Harry Sullivan's War. Shortly before his death he was discussing, with series editor Nigel Robinson, the possibility of adapting his unused movie script Doctor Who Meets Scratchman (co-written with Tom Baker) into a novel.

Terence Dudley joined the BBC in 1958 and worked with them throughout his life in various capacities. He was a producer on the SF-flavoured The Big Pull, Doomwatch (working alongside Kit Pedler and Gerry Davis) and Survivors (the mid-seventies post-apocalyptic drama created by Terry Nation, although the two did not see eye-to-eye on how the series should evolve). He directed episodes of Out of the Unknown, Doomwatch, Softly, Softly, Detective, Colditz, Survivors, To Serve Them All My Days, Secret Army, All Creatures Great and Small and Doctor Who (Meglos). He wrote for Doomwatch, the Wednesday Play (A Piece of Resistance, 1966), Survivors and Doctor Who (Four to Doomsday, Black Orchid, The King's Demons), and the pilot of Who-spin-off K9 and Company.