When does Hogan's Heroes return?

Bob Crane starred as Colonel Robert E. Hogan, coordinating an international crew of Allied prisoners covertly running a special operations group from the camp. Werner Klemperer played Colonel Wilhelm Klink, the gullible commandant of the camp, and John Banner played the blundering but lovable sergeant-of-the-guard, Hans Schultz. The plot occurs during the permanent winter season in the fictionalized Stalag 13 just outside Hammelburg in Nazi Germany, though details in the show are inconsistent with the real-life camp and city's location.