Sandra and Culebra's big wedding day has arrived, but one guest is missing: Rosa Ruano. After the celebration, the Castillo family launches a risky plan to find her. At the police station, they discover Rosa's phone was last detected deep in a remote forest. Everyone heads into the dark woods except Mario and Dora, who stay in the car. The others find a huge building exactly where the phone signal ends. Inside, they discover hallways covered with the initials 'D.N.A.' and classrooms where young people with powers are trained. Meanwhile, Dora senses something nearby through her abilities…