The House That Shadows Built the Marx Brothers, with Davison Clark playing Mr. Lee, Theatrical Producer, which was intended to promote their forthcoming 1931 film "Monkey Business" (Clark later played the role of the frustrated Passport Official in "Monkey Business" and would also appear in the war scene in "Duck Soup"). The segment, containing material which was never included in any other Marx Brothers film, is a re-working of the first scene of their first successful Broadway revue "I'll Say She Is" (1924), which Groucho considered to have been the funniest work in the Brothers' career. Except for a few name changes and additional gags,
Marx Brothers and the Marx Brothers. Most of the comedians provided their own voices for their animated counterparts, except for Fields and Chico Marx (both had died), and Zeppo Marx (who had left show business in 1933). Voice actor Paul Frees filled in for all three (no voice was needed for Harpo). The Marx Brothers' segment was a reworking of a scene from their Broadway play "I'll Say She Is", a parody of Napoleon that Groucho considered among the brothers' funniest routines. The sketch featured animated representations, if not the voices, of all four brothers. Romeo Muller is credited as having written