Doctor Who Unbound is a series of audio plays produced by Big Finish Productions. Free from the constraints of continuity, the Doctor Who Unbound audios present a series of "What if...?" scenarios, and cast new actors in the role of the Doctor.
David Warner is reprising his version of the Doctor in series 3 of The New Adventures of Bernice Summerfield subtitled The Unbound Universe.
References
Doctor Who Unbound Wikipedia(Text) CC BY-SA