Buster Keaton

as The Boy

Margaret Leahy

as The Girl

Wallace Beery

as The Villain

Joe Roberts

as The Girl's Father

Lillian Lawrence

as The Girl's Mother

Kewpie Morgan

as The Emperor / Cave Man / Roman Thug

Lionel Belmore

as Undetermined Role (uncredited) (unconfirmed)

George Davis

as Roman Guard Knocked Down (uncredited)

Louise Emmons

as Old Fortune Teller (uncredited)

Blanche Payson

as The Amazon (uncredited)