Herr Flick is in the dungeon, but there are plans afoot from several sources to spring him - although not necessarily leave him a free man.
Smoke bombs will provide a diversionary tactic to distract Gruber so René can photograph the invasion plans, but they end up being sent down the wrong chimney.
Helga and Von Klinkerhoffen dine together, while the Gestapo infiltrate as a musical interlude to gain intelligence on plans to assassinate Hitler.
It's the day of René and Denise's wedding - except the Gaullist Resistance and the cafe staff have plans in place to ensure the two are not betrothed.
Michelle orders René to provide the catering while gathering information on the plans, with the resulting intelligence to be sent to England via a duck.
The cafe finds itself the location of a meeting between a group of German Generals, disguised as French onion-sellers.
René must rob a bank to raise the ransom to pay the Communist Resistance to free Mimi, Gruber, the Colonel, and Bertorelli.
The Gestapo discover the whereabouts of the landmines and decide to lie in wait in order to arrest the Resistance members collecting them.
René's attempts to disguise stolen gold don't work as well as he hoped, and Crabtree gives his own unique rendition of a popular French song.
René and Edith are heading for the altar, while Michelle initiates Operation Waterloo, the latest plan to return the British Airmen to England.