Lon Chaney
Professor Echo / Granny O'Grady
Mae Busch
Rosie O'Grady
Matt Moore
Hector McDonald
Victor McLaglen
Hercules
Harry Earles
Tweedledee aka Little Willie
Matthew Betz
Detective Regan
Edward Connelly
Judge
William Humphrey
Attorney for Defense
E. Alyn Warren
Prosecuting Attorney
Carrie Daumery
Pet Shop Customer (uncredited)
Mickey McBan
Boy Watching Hercules' Act (uncredited)
Wilmuth Merkyl
Jeweler (uncredited)
Louis Morrison
Police Commissioner (uncredited)
Margie Angus
Twin (uncredited)
Mary Angus
Twin (uncredited)
Walter P. Cole
Human Skeleton (uncredited)
Delmo Fritz
Sword Swallower (uncredited)
Alice Julian
Fat Lady (uncredited)
Peter Kortes
Sword Swallower (uncredited)
John Millerta
Wild Borneo Man (uncredited)
Majorie Morton
Mrs. Arlington (uncredited)
Walter Perry
Dime Museum Announcer (uncredited)
Louis Shank
Newsboy (uncredited)
Vera Vance
Dancer (uncredited)
Charles Wellesley
John Arlington (uncredited)
Percy Williams
Butler (uncredited)