Frederick Worlock

as Blodgett

as Horace / Inspector Craven (voice)

as Cadum

as Clerk

as Colonel Cavanaugh

as Park Patrol Constable-in-Charge Ernie Hobbs

as Prof. William Kilbane

as Prime Minister

as Dr. Onslow

as Geoffrey Musgrave

as Otto

as Dr. Richards

as Canadian Major

as Dr. Heath

as Lord Gerald Risborough

as Solicitor-General

as English Governor

as Insp. Hugh Drake

as Grideau, the Prison Head

as Colonel Demassey

as Dr. Cesar Sabbatt