PROBE: The Zero Imperative

Caroline John

Dr. Elizabeth Shaw

Jon Pertwee

Dr. Jeremiah O'Kane

Sylvester McCoy

Dr. Colin Dove

Colin Baker

Peter Russell

Mark Gatiss

Dr. William Bruffin

Louise Jameson

Patricia Haggard

Sophie Aldred

Public Relations Officer

Linda Lusardi

Louise Bayliss

David Terence

Daniel O'Kane / Eustace O'Kane

Nicola Fulljames

Dr. Beatrice Hearst