The Castillo family returns home for Christmas after working all year for ADN. They are exhausted but happy to reunite with Mario and Dora, who have left the academy. Even before arriving home, they must act in the subway to stop a pickpocket without revealing their powers. They attend Dora’s school play, where the girl suffers bullying from some classmates and ends up using her electrical powers in an uncontrolled way. The family has to clean up the mess: erase recordings and the memory of a teacher who saw everything. Rosa Ruano, wanting to help Borja in his new job as a police officer, tries to make a good impression on his boss, Otero. She and her partner Nacho investigate a strange case related to the Christmas toy of the moment: the “Trickster Elf.”