Groucho Marx Captain Jeffrey T. Spaulding Harpo Marx The Professor Chico Marx Signor Emanuel Ravelli Zeppo Marx Horatio Jamison Lillian Roth Arabella Rittenhouse Margaret Dumont Mrs. Rittenhouse Louis Sorin Roscoe Chandler Hal Thompson John Parker Margaret Irving Mrs. Whitehead Kathryn Reece Grace Carpenter Robert Greig Hives Edward Metcalf Hennessey Robert Allen House Party Guest (uncredited) Donald MacBride House Party Guest (uncredited) Ann Roth House Party Guest (uncredited) Fredi Washington Party Guest Victor Heerman Director George J. Folsey Director