as Laelius
as Judge (uncredited)
as Dr. Heath
as Prof. William Kilbane
as Colonel Cavanaugh
as Lord Gerald Risborough
as Solicitor-General
as Horace / Inspector Craven (voice)
as Dr. Onslow
as Clerk
as Dr. Richards
as J. Norton Sims
as Otto
as Insp. Hugh Drake
as Park Patrol Constable-in-Charge Ernie Hobbs
