Peter Davison as The Doctor (5)

Jon Pertwee as The Doctor (3)

Patrick Troughton as The Doctor (2)

Richard Hurndall as The Doctor (1)

Tom Baker as The Doctor (4) (archive footage)

William Hartnell as The Doctor (1) (archive footage)

Janet Fielding as Tegan Jovanka

Mark Strickson as Turlough

Elisabeth Sladen as Sarah Jane Smith

Carole Ann Ford as Susan Foreman

Nicholas Courtney as Brig. Lethbridge-Stewart

Anthony Ainley as The Master

Philip Latham as Borusa

Lalla Ward as Romana (archive footage)

Dinah Sheridan as Chancellor Flavia

Paul Jerricho as The Castellan

David Banks as Cyber Leader

Mark Hardy as Cyber Lieutenant

Richard Mathews as Rassilon

Frazer Hines as Jamie McCrimmon

Wendy Padbury as Zoe Heriot

David Savile as Colonel Crichton

Caroline John as Liz Shaw

Richard Franklin as Captain Yates

John Leeson as K9 (voice)

Roy Skelton as Dalek (voice)

John Scott Martin as Dalek Operator

Ray Float as Sergeant

Keith Hodiak as Raston Warrior Robot

Stuart Blake as Commander

Stephen Meredith as Technician

John Tallents as Guard

William Kenton as Cyber Scout