Big Finish's current licence from the BBC allows it to produce audio dramas featuring the first twelve incarnations of the Doctor and associated characters introduced into the series between 1963 and 2017.
They include Susan (Carole Ann Ford), Ian Chesterton (William Russell), Vicki (Maureen O'Brien), Steven Taylor (Peter Purves), Sara Kingdom (Jean Marsh), Polly (Anneke Wills), Jamie McCrimmon (Frazer Hines), Victoria Waterfield (Deborah Watling), Zoe Heriot (Wendy Padbury), Jo Grant (Katy Manning), Brigadier Lethbridge-Stewart (Nicholas Courtney), Sergeant Benton (John Levene), Mike Yates (Richard Franklin), Leela (Louise Jameson), K9 (John Leeson), Romana I (Mary Tamm), Romana II (Lalla Ward), Adric (Matthew Waterhouse), Nyssa (Sarah Sutton), Tegan Jovanka (Janet Fielding), Vislor Turlough (Mark Strickson), Peri Brown (Nicola Bryant), Melanie Bush (Bonnie Langford) and Ace (Sophie Aldred).
Ford, Russell, O'Brien, Purves, Marsh, Wills, Hines, Watling, Padbury, Manning, Jameson, Tamm, Ward, Sutton, Strickson and Aldred have all reprised their roles in this series along with John (Liz).
New companions created for the audio series include Evelyn Smythe (Maggie Stables), Charley Pollard (India Fisher), Erimem (Caroline Morris), Hex Schofield (Philip Olivier), C'rizz (Conrad Westmaas), Lucie Miller (Sheridan Smith), Thomas Brewster (John Pickard), Abby (Ciara Janson), Tamsin Drew (Niky Wardley), Elizabeth Elizabeth Klein (Tracey Childs), Flip Jackson (Lisa Greenwood), Molly O'Sullivan (Ruth Bradley), Liv Chenka (Nicola Walker), Helen Sinclair (Hattie Morahan) and Constance Clarke (Miranda Raison).
Lisa Bowerman has appeared as Bernice Summerfield, a companion from the Virgin New Adventures, in several Doctor Who audio dramas as well as in original productions with her as the central character.
In May 2015, BBC Radio 4 Extra broadcast the first series of Fourth Doctor Adventures starring Tom Baker and Louise Jameson.
Nicholas Briggs said: “All our writers, directors, script editors and producers continue to work tirelessly to create exciting new adventures for all our Doctors.
Baker had previously declined to feature in Big Finish releases, but after recording The Fourth Doctor Box Set had been encouraged to participate.
[31] Big Finish's Creative Director Nicholas Briggs described them as "...really imaginative, celebratory adventures that feel like Classic Doctor Who turned right up to eleven, in the very best of ways".
Following on directly from the Eighth Doctor Adventures, Dark Eyes consists of four box sets, each made up of four hour-long episodes, the first released in November 2012 and the last in March 2015.
[85][86] In May 2020, Big Finish announced that the Monthly Range would conclude with its 275th issue in March 2021, to be replaced with regular releases of each Doctor in their own boxsets throughout the year from January 2022.
[87] Big Finish Productions began producing audio dramas featuring the Fifth, Sixth, and Seventh Doctors, starting with The Sirens of Time in July 1999.
[89] From 2008 to late 2011, only one Eighth Doctor release was produced for the main range: The Company of Friends, featuring companions from other media to the audio plays, and the historical figure Mary Shelley.