Massimo becomes Alberto's father figure, and Alberto and Luca's family enjoy interacting with the humans in Portorosso. During the credits, Luca meets Giulia's mother and attends school, while showing off his sea monster appearance. Luca's family, Massimo, and Alberto see Luca and Giulia off at the train station, where they all promise to stay in touch. Luca and Alberto purchase a Vespa, but the latter sells it to buy a train ticket for Luca, allowing him to go to school in Genoa with Giulia. Meanwhile, Ercole is humiliated by his henchmen, who were fed up with his abuse.

Other disguised sea monsters reveal themselves, including Luca's family, and the townsfolk happily welcome them.

He also points out they have crossed the finish line and won the race. Luca and Alberto turn back to help her, and are defended from monster hunters by Massimo, who reveals that the boys are his friends. They flee Ercole, who now intends to harpoon them Giulia helps by smashing her bike into Ercole's, but she is injured. Alberto arrives with an umbrella, but Ercole knocks it away and both boys are revealed as sea monsters. After several mishaps, Luca takes the lead in the bicycle race, but is forced to take shelter when it starts to rain. Luca sets out to win the Vespa on his own, to make things right. Luca attempts to reconcile with Alberto, and discovers that Alberto's father deliberately abandoned him long ago, making Alberto think he was a bad kid who should not have friends. Giulia later deliberately splashes water on Luca and sees his true identity she sends him away for his own good. Luca feigns surprise at the transformation, and a heartbroken Alberto is driven off by Ercole. In anger, Alberto deliberately reveals his true form to Giulia. When Luca starts ignoring Alberto's advice, and tries changing their plans to going to school instead of traveling, he and Alberto fight. Alberto becomes jealous of Luca and Giulia's growing friendship. Giulia teaches Luca about school, and the two bond over a love of learning, especially about astronomy. While the boys befriend Giulia's fisherman father Massimo, Luca's parents head to the surface to find their son. Unable to swim without revealing themselves, Luca and Alberto respectively take on the biking and pasta-eating races, while Giulia takes the swimming race. In hopes of winning the money needed for a Vespa, the boys and Giulia form a team for the triathlon, which involves swimming, pasta-eating, and biking. The boys run afoul of Ercole Visconti, a local bully and repeat champion of the Portorosso Cup Race, but Giulia Marcovaldo, a young girl, helps them escape. In retaliation, Luca and Alberto run away to Portorosso to find a Vespa and travel the world. Upon discovering their son's actions, Luca's parents plan to send Luca to live in the deep sea with his uncle Ugo. Luca follows Alberto to his hideout, where the boys connect while making and riding a makeshift, fragile Vespa. Alberto encourages Luca to adventure out of the ocean, showing him that sea monsters look exactly human when dry, but return to their true forms when wet. One day, Luca meets Alberto Scorfano, a fellow sea monster child who lives alone above the surface, claiming that his father simply isn't around much. Luca Paguro, a timid young sea monster living off the coast of the Italian city Portorosso, herds goatfish and is forbidden by his parents to approach the surface, as humans might hunt him.

Luca pixar