No't to be confused with Soldier for a Day.
Emperor for a Day is the 44th episode of Season 5, It takes place during the Napoleonic Era of France. During the Napoleonic wars, Oggy cleans the French camp. Napoleon asks Oggy to take his place, so that he can go to a gallant rendezvous. The cockroaches, witnesses of the scene, will do everything to unmask Oggy.