On screen
Cast
12 credited performers
Tom Baker
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Ian Marter
Harry Sullivan
Wendy Williams
Vira
Artwork unavailable
Kenton Moore
Noah
Artwork unavailable
Richardson Morgan
Rogin
John Gregg
Lycett
Artwork unavailable
Christopher Masters
Libri
Artwork unavailable
Stuart Fell
The Wirrn
Nick Hobbs
The Wirrn
Artwork unavailable
Gladys Spencer
High Minister (voice)
Peter Tuddenham
Voices on Nerva (voice)