Naughty twins Zip & Zap are punished and sent to summer school at Hope, a strict re-education center run by Falconetti, who rules with a heavy hand and an eyepatch and forbids all forms of recreation and entertainment. They form the Marble Gang, the children's Resistance, in order to defy the evil headmaster. Guided by intelligence, bravery and unbreakable faith in friendship, they uncover a mysterious secret hidden deep within the school and end up having the most exciting adventure of their lives.

Director: Oskar Santos

Writer: Jorge Lara, Oskar Santos, Francisco Roncal

Actors: Javier Gutiérrez, Raúl Rivas, Daniel Cerezo

Production: N/A