Charles Laughton
Tiberius Claudius (archive footage)
Acting
Robert Graves
Interviewee [original author]
Writing
Josef von Sternberg
Interviewee [director] / Himself (archive footage)
Directing
Merle Oberon
Interviewee / Messalina (archive footage)
Acting
Flora Robson
Interviewee / Livia (archive footage)
Acting
Emlyn Williams
Interviewee / Caligula (archive footage)
Acting
Eileen Corbett
Interviewee [script girl]
Acting
John Armstrong
Interviewee [costume designer]
Costume & Make-Up
Dirk Bogarde
Narrator
Acting
John Abbott
Himself – Ms. Robson's Host (uncredited)
Acting
Robert Newton
Cassius, Captain of Caligula's guard (archive footage; uncredited)
Acting
Basil Gill
Xenophon, Claudius' doctor (archive footage; uncredited)
Acting