Probe / P.R.O.B.E. : The Zero Imperative

The Zero Imperative was the first story in BBV Productions' P.R.O.B.E. series. It was written by Mark Gatiss and was directed by Bill Baggs. It featured Caroline John reprising the role of Liz Shaw and a number of former Doctor Who actors in new roles, namely Louise Jameson as recurring character Patsy Haggard.

It was the first BBV film to feature a licensed Doctor Who character, having previously released a series featuring Colin Baker and Nicola Bryant as characters very similar to the Doctor and Peri Brown. It introduced the Preternatural Research Bureau (or P.R.O.B.E.), a neglected special division that dealt with the strange and out of the ordinary. Liz was given an assistant, Louise Bayliss, who was written out in the next story. Jon Pertwee, Colin Baker and Sylvester McCoy all appeared as doctors, albeit a doctor of philosophy in Baker's case, as a reference to their Doctor Who roles.

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