PROBE: The Zero Imperative
Dr. Elizabeth Shaw
Dr. Jeremiah O'Kane
Dr. Colin Dove
Peter Russell
Dr. William Bruffin
Patricia Haggard
Public Relations Officer
Louise Bayliss
Daniel O'Kane / Eustace O'Kane
Dr. Beatrice Hearst
Dr. Julie Gilchrist
Cummings
Orderly
Ghostly Child Voice
Patient One
