The Katzenjammer Kids
The "Katzenjammer Kids" characters initially appeared outside comics in a handful of live-action silent films, with the first released in 1898. This first film, titled "The Katzenjammer Kids In School", was made for the Biograph Company by William George Bitzer. This film was followed in 1900 by another Bitzer-Biograph film, "The Katzenjammer Kids in Love."