UNIT is a series of audio plays produced by Big Finish Productions focused on the fictional military organisation of the same name which features regularly in the British science fiction programme Doctor Who. Several actors from the series have reprised their roles for the plays.
The New Series
UNIT was relaunched in 2015 as UNIT: The New Series. Each series is principally lead by Jemma Redgrave and Ingrid Oliver reprising their roles of Kate Stewart and Petronella Osgood from the relaunched series of Doctor Who.
References
UNIT (Big Finish series) Wikipedia(Text) CC BY-SA