Peter Davison

The Doctor

Sarah Sutton

Nyssa

Janet Fielding

Tegan Jovanka

Mark Strickson

Vislor Turlough

Nicholas Courtney

Brigadier Alistair Gordon Lethbridge-Stewart

Valentine Dyall

The Black Guardian

David Collings

Mawdryn

Angus MacKay

Headmaster

Stephen Garlick

Ibbotson

Roger Hammond

Dr. Runciman

Sheila Gill

Matron

Peter Walmsley

Mutant

Brian Darnley

Mutant

William Hartnell

The Doctor (1) (archive footage)

Patrick Troughton

The Doctor (2) (archive footage)

Jon Pertwee

The Doctor (3) (archive footage)

Tom Baker

The Doctor (4) (archive footage)

Roger Delgado

The Master (archive footage) (Special Edition)

Michael Kilgarriff

K1 Robot (archive footage)

Stanley Mason

Bok (archive footage) (Special Edition)

Stephen Thorne

Omega (archive footage) (Special Edition)

John Woodnutt

Duke of Forgill/Broton (archive footage) (Special Edition)