On screen
Cast
12 credited performers
Peter Davison
The Doctor
Matthew Waterhouse
Adric
Sarah Sutton
Nyssa
Janet Fielding
Tegan Jovanka
Anthony Ainley
The Master / The Portreeve
Artwork unavailable
Dallas Cavell
Head of Security
Artwork unavailable
Frank Wylie
Ruther
Derek Waring
Shardovan
Michael Sheard
Mergrave
Artwork unavailable
Souska John
Child
Tom Baker
The Doctor (archive footage)
Artwork unavailable
Adrian Gibbs
The Watcher (archive footage)