Doctor Who: The Second Monsters Collection

Robert Holmes was a scriptwriter for numerous television programmes including Dr Finlay's Casebook, Dixon of Dock Green, The Saint, Juliet Bravo and Bergerac. He was involved with Doctor Who for over fifteen years and wrote numerous scripts including Jon Pertwee's debut serial as the Third Doctor, Spearhead from Space, and Fifth Doctor Peter Davison's final serial, The Caves of Androzani (voted by fans in 2009 as the best Doctor Who story in history). He introduced both the Autons and the Sontarans to the show and was script editor during the first three years of Tom Baker's tenure as Fourth Doctor. Holmes also contributed to several other sci-fi shows including Doomwatch, The Nightmare Man and Blake's 7. He died in 1986, aged 60.

Christopher Hamilton Bidmead was born in 1941. He trained as an actor at the Royal Academy of Dramatic Art (RADA) and subsequently played leading roles on the West End stage and television. For several years he was a regular voice on radio as a member of the BBC Drama Repertory Company.

He began scriptwriting while working with the Royal Shakespeare Company, and by the early Seventies was writing television scripts for the Thames TV serials Harriet's Back in Town and Rooms. At the same time a long-standing interest in science drew him towards technical journalism. His articles in the New Scientist prompted BBC producer Robert Banks Stewart to recommend him for the post of script editor on Doctor Who when it was vacated by Douglas Adams at the beginning of the '80s.

After a year in that role he signed off on the job by delivering two stories, Logopolis and Castrovalva, and returned to freelance projects - including a third Doctor Who story, Frontios, and novelisations of all three for the Target range of books.

His stint on Doctor Who introduced him to the use of personal computers, and for the past quarter century he has continued to work as an IT journalist, writing for a range of publications including Wired magazine and The Daily Telegraph. Over the last decade he has been a regular columnist on PCPlus magazine.

(Author biography by David J. Howe, author of The Target Book, the complete illustrated guide to the Target Doctor Who novelisations.)

Ben Aaronovitch writes tie-in novels and TV scripts, and wrote the screenplays for the Seventh Doctor episodes Battlefield and Remembrance of the Daleks. He is the author of a series of audio dramas based on TV's Blake's 7, as well as the acclaimed Rivers of London series.