Colin Baker
The Doctor (14 eps)
Nicola Bryant
Perpugilliam "Peri" Brown (14 eps)
Bonnie Langford
Melanie Bush (14 eps)
Roger Brierley
Drathro (voice) (4 eps)
Christopher Ryan
Kiv (4 eps)
Nabil Shaban
Sil (4 eps)
Tony Scoggo
Grenville (4 eps)
Patrick Ryecart
Crozier (4 eps)
Honor Blackman
Professor Lasky (4 eps)
Joan Sims
Katryca (4 eps)
Tony Selby
Glitz (4 eps)
Brian Blessed
King Yrcanos (4 eps)
Michael Craig
Commodore (4 eps)
Adam Blackwood
Balazar (4 eps)
Trevor Laird
Frax (4 eps)
Glen Murphy
Dibber (4 eps)
Alibe Parsons
Matrona Kani (4 eps)
Malcolm Tierney
Doland (4 eps)
Simon Slater
Edwardes (4 eps)
Yolande Palfrey
Janet (4 eps)
Tom Chadbon
Merdeen (4 eps)
Arthur Hewlett
Kimber (4 eps)
Gordon Warnecke
Tuza (2 eps)
Anthony Ainley
The Master (2 eps)