Crossovers
A prolific artist and writer, Opper's other creations included Willie, Hans from Hamburg, Our Antediluvian Ancestors, And Her Name Was Maud and Happy Hooligan. The characters would occasionally make guest appearances outside their own strips. On one occasion, And Her Name Was Maud featured an appearance by Alphonse and Gaston aboard a runaway sleigh, each of them bowing to the other in the seat.
Read more about this topic: Alphonse And Gaston