Maciste takes advantage again of a break of acting in order to wash away injustice and castigate the wicked, this time in the name of dynastic legitimacy. Otis, the prince of Sirdagna kingdom, lives undercover in a foreign land, waiting to ascend the throne; Stanos the evil ruler though, is willing...
Three children attend an institute bordering a middle school where Lauretta studies. The boys befriend her and decide one night to go see the fireworks, but one of the children is injured by a bomb. This situation causes the injured child's father and nanny to fall in love.