汤姆·贝克

Tom Baker

饰：Doctor Who,Narrator

Gerald Campion

Gerald Campion

饰：Porter (Wilkins)

Denis Carey

饰：Professor Chronotis

克里斯托弗·尼姆

Christopher Neame

饰：Skagra

莱拉·沃德

Lalla Ward

饰：Romana

哈里·弗雷德尔

Harry Fielder

戴维·布列利

David Brierly

饰：K9,Computer,/ (as David Brierley)

丹尼尔·希尔

Daniel Hill

饰：Chris Parsons

Shirley Dixon

Shirley Dixon

饰：Voice of Skagra's Ship

Victoria Burgoyne

饰：Clare Keightley

Derek Pollitt

Derek Pollitt

饰：Professor Caldera (episode 4)