Bernard Bresslaw
Henry Jekyll / Teddy Hyde
Jon Pertwee
Victor Jekyll
Reginald Beckwith
Reginald
Maudie Edwards
Henrietta Jekyll
Richard Wattis
Barclay
Elwyn Brook-Jones
Dandy
Michael Ripper
Fish
David Lodge
Peewee
Keith Smith
Figures
Michael Ward
Mark Pasco
John Harvey
Sergeant Barnes
Harold Goodwin
Benny
Norma Marla
Angel
Jess Conrad
Bimbo
Mary Wilson
Lizzie
Geremy Phillips
Tiger
Roger Avon
Reporter
Cyril Chamberlain
Police Sergeant
Robert Desmond
Dizzy
Alexander Doré
Shop Customer
Jean Driant
M. Blum
Reginald Marsh
Reporter
Verne Morgan
Barman
Nicholas Tanner
Commissionaire
Ian Wilson
Small Man
Lucy Griffiths
Cellist (uncredited)
Jean Muir
Snout