Peter Davison

The Doctor

Matthew Waterhouse

Adric

Sarah Sutton

Nyssa / Ann Talbot

Janet Fielding

Tegan Jovanka

Michael Cochrane

Lord Cranleigh

Barbara Murray

Lady Cranleigh

Gareth Milne

The Unknown / George Cranleigh

Moray Watson

Sir Robert Muir

Ivor Salter

Sergeant Markham