BPJ masks are on their way, into the night to save the day! By day, they are Connor, Greg and Amaya, but by night they are Catboy, Gekko and Owlette, the PJ Masks.
Join them in this super-cool adventure storybook based on the episode 'Gekko and the Mayhem at the Museum' - Romeo has made a Big Box of Bad and has made the museum his headquarters. If the PJ Masks don't stop him, Romeo will control the whole city! Catboy, Owlette and Gekko must work together to beat the baddie.