Don Juan DeMarco is the story of a 21 year old (Johnny Depp) who assumes the guise of the greatest lover in the world. One day, spurned by a centrefold model, he climbs up a billboard ad in Manhattan, NY, and demands that the greatest sword fighter in the world duel with him so he may die a noble death. He is talked out of it by Don Octavio de Flores, who is actually psychiatrist Jack Mickler (Marlon Brando).
Reality and fantasy intertwine in this movie as Don Octavio enrolls Don Juan as his patient and falls under his spell. He searches to rekindle the fire in his life inspired by the stories of Don Juan's conquests with 1502 girls ("I do think that number was a bit higher than she expected") and his sword fights. Thus you have Jack Mickler suddenly taking his wife out to dinner, buying her presents, and hiring musicians to serenade her. That pretty much describes the plot of the movie, which is essentially a war between romantic delusions and cold psychiatry.
There is some existential value to this movie, as questions like what is worth living and dying for are asked. But the answer has become a cliche, especially in Hollywood movies. Some parts are rather funny, and it's full of mushy lines. The acting overall is quite brilliant, particularly Marlon Brando's performance as Don Octavio. This is definitely a movie for those who think he is a has-been. Brando not only rises to the skeptics' challenge, but also proves them wrong.