Guest Stars Lynda Bellingham as The Inquisitor Michael Jayston as The Valeyard Tony Selby as Glitz Adam Blackwood as Balazar Joan Sims as Katryca Tom Chadbon as Merdeen Glen Murphy as Dibber Timothy Walker as Grell David Rodigan as Broken tooth Roger Brierley voices Drathro Sion Tudor Owen as Tandrell Billy McColl as Humker Uncredited Robert Goodman as Crew Member