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:

• The Tower
• Sergeant Schultz Meets Mata Hari
• The Return of Major Bonacelli