Karl Langenscheidt appeared in the following episodes: * The Informer * Hold That Tiger * The Late Inspector General * The Flight of the Valkyrie * German Bridge is Falling Down * Movies Are Your Best Escape * Happiness Is a Warm Sergeant * Oil for the Lamps of Hogan * Anchors Aweigh, Men of Stalag 13 * The Pizza Parlor * Art for Hogan's Sake * Will the Blue Baron Strike Again? * Klink's Masterpiece * Kommandant Schultz Langenscheidt is mentioned but does not appear in the following episodes: