Carne Valley is hit by a scorching heat wave so Pepe and the gang head to a local water park to try and cool off. When they arrive they find it ominously ‘closed’ with its gates padlocked. Not letting this interfere with their quest, the kids scale the fence and head straight for the pool. Once inside, instead of finding fun they end up on the run from a cult of kids who want to offer them to Craka, the drain-clog monster who lives at the bottom of the pool.