Colin Baker

The Doctor

Bonnie Langford

Mel Bush

Michael Jayston

The Valeyard

Lynda Bellingham

The Inquisitor

Honor Blackman

Professor Sarah Lasky

Michael Craig

Commodore Travers

Denys Hawthorne

Rudge

Yolande Palfrey

Janet

Malcolm Tierney

Doland

David Allister

Bruchner