This film introduces us to Baron Muenchausen, a forgotten heroic figure in the new "Age of Reason" in the late 18th Century.
The Baron comes to a besieged town to find his story has become a theatre act, put on to cheer up the citizenry in the war weary city. The city is run (on a clear parody of the French Revolution) by cruel and ruthless public servants, exemplified by the Right Ordinary Horatio Jackson, who orders the execution of a soldier (Sting) for an act of extraordinary courage in defending the city against the Turkish besiegers, on the grounds that his bravery was demoralising the other troops. The Baron intervenes in the theatre and gradually takes over the stage to tell his tale, which introduces us to various fantastic adventures, and the Baron joins up with his friends who have wondrous powers. The man character of the film is Sally, the young daughter of the impresario who is putting on the play, who asks questions adults could not.
There is a running tension between the Public Servants and the Baron, who says that he is the only person who can end the war, and he ultimately succeeds. Some parts of the film are a little overdone. I don't think that Robin Williams' character gels with the others, but it is a splendid tale of a lament by the Baron for his lost world in the new age of Science and Reason. Well worth watching again and again, for the story, the scenery, and the tales, a timeless classic.