Madrid, Carnival Sunday. A night watchman finds the body of a woman, a rich and greedy moneylender who has apparently been murdered. The prime suspect is a watchmaker who owed her a lot of money.

Xavier, Miguel, Johnny, Ricky, and Charlie (the members of Menudo) decide to take a hot air ballon to a concert and end up crashing in the woods. The boys have their own adventures (jumping in the mud, skateboarding, stealing motorbikes, playing practical jokes on each other, throwing sea sponges, and meeting beautiful girls) while the record company tries to get them back so that they can perform in concert.

A virtuous Spanish princess becomes queen of Portugal, and soon is affected by the social struggles and the reckless fight to power between the king's faction and that of his son's.

Kingdom of Castile, the late fifteenth century. The film chronicles the events that Cristóbal Colón lived (Antonio Vilar) from their stay in the Convent of La Rabida, his meeting with the Catholic Monarchs and, above all, the great odyssey that led to cross the Atlantic and reach the shores of America (1492), thus beginning a new era in the history of mankind.