It so happens that Fantozzi falls into poverty and the help of Robin Hood is not enough to satisfy him.
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So Ugo to be more courageous and discovers the sword Excalibur to participate in a duel between knights.
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During periods to follow Fantozzi finally arrives in the Middle Ages where together with Filini back from Crusades in the Holy Land to return to his wife Pina who wore the chastity belt.