Tom Baker as The Doctor

Matthew Waterhouse as Adric

Sarah Sutton as Nyssa

Janet Fielding as Tegan Jovanka

Anthony Ainley as The Master

Delore Whiteman as Aunt Vanessa

Tom Georgeson as Detective Inspector

John Fraser as The Monitor

Christopher Hurst as Security Guard

Adrian Gibbs as The Watcher (uncredited)

Peter Davison as The Doctor

Peter Pratt as The Master (archive footage)

Bruce Purchase as The Captain (archive footage)

Michael Wisher as Davros (archive footage)

Valentine Dyall as The Black Guardian (archive footage)

Elisabeth Sladen as Sarah Jane Smith (archive footage)

Ian Marter as Harry Sullivan (archive footage)

Nicholas Courtney as Brigadier Lethbridge-Stewart (archive footage)

Louise Jameson as Leela (archive footage)

Mary Tamm as Romana (I) (archive footage)

Lalla Ward as Romana (II) (archive footage)