Alegría is a mood, a state of mind. The themes of the show, whose name means "jubilation" in Spanish, are many. Power and the handing down of power over time, the evolution from ancient monarchies to modern democracies, old age, youth - it is against this backdrop that the characters of Alegría play out their lives. Kings' fools, minstrels, beggars, old aristocrats and children make up its universe, along with the clowns, who alone are able to resist the passing of time and the social transformations that accompany it.

Frac, a mime who is suffering from a severe bout of depression, happens to meet a troupe of circus entertainers and immediately falls in love with one of the stars, Giulietta. But while his affection for Giulietta and admiration for the performers gives him a new lease on life, Giulietta's father, the leader of the troupe, opposes the relationship and is determined to keep them apart. Meanwhile, Frac and Giulietta discover a gang of children who are held prisoner by a criminal leader who forces them to do his bidding, and they devise a plan to win the kids their freedom. .