P.R.O.B.E.

P.R.O.B.E. is a series of videos mostly written by Mark Gatiss and produced by BBV Productions. It predates Torchwood as the first ongoing spin-off of the Doctor Who universe.

The series features Caroline John as Liz Shaw, working for the Preternatural Research Bureau. Many former Doctor Who actors, including former Doctors Jon Pertwee, Peter Davison, Colin Baker and Sylvester McCoy, appear in the series playing different roles. (Due to licensing restrictions, no overt reference to The Doctor is permitted.) Doctor Who alumna Louise Jameson co-stars with Caroline John in all four films, as Patricia Haggard.