Charles Laughton

Tiberius Claudius (archive footage)

Robert Graves

Interviewee [original author]

Josef von Sternberg

Interviewee [director] / Himself (archive footage)

Merle Oberon

Interviewee / Messalina (archive footage)

Flora Robson

Interviewee / Livia (archive footage)

Emlyn Williams

Interviewee / Caligula (archive footage)

Dirk Bogarde

Narrator

John Abbott

Himself – Ms. Robson's Host (uncredited)

Robert Newton

Cassius, Captain of Caligula's guard (archive footage; uncredited)

Basil Gill

Xenophon, Claudius' doctor (archive footage; uncredited)