Caroline John

as Dr. Elizabeth Shaw

Louise Jameson

as Patricia Haggard

Geoffrey Beevers

as Brian Rutherford / Wittaker

Peter Davison

as Gavin Purcell

Terry Molloy

as DI Burke

Daniel Harcourt

as Christian Purcell

Reece Shearsmith

as Andrew Powell

Mark Gatiss

as Georgie

Stephen Dolomore

as Luke Pendrell

Jonathan Rigby

as Cummings

Charmian May

as Mrs. Taploe

Nicholas Briggs

as Ministry Extra