Gareth Thomas
— Roj Blake
Sally Knyvette
— Jenna Stannis
Paul Darrow
— Kerr Avon
Jan Chappell
— Cally
Michael Keating
— Vila Restal
David Jackson
— Olag Gan
Peter Tuddenham
— Zen (voice)
Stephen Greif
— Space Commander Travis
Jacqueline Pearce
— Supreme Commander Servalan
Tony Caunter
— Ensor
Suzan Farmer
— Meegat
James Lister
— Maryatt
Derek Farr
— Ensor / Orac / Satellite
James Muir
— Phibian
Sheila Ruskin
— Alta One
Harriet Philpin
— Alta Two