It all begins when siblings Laura (12) and Lazlo (10) are sent to spend the summer in a racing-themed camp, in a distant valley of an isolated mountain area. Things take a strange turn when they discover that the camp is actually for KID MONSTERS! Who RACE AMAZING MONSTER CARS! Very quickly, they discover that life at the camp is not only about racing. Monster 500 is basically a summer camp like any other: you have fun, you make friends, you sometimes have to go through little trials… And even if life in community is not always easy when your roommates are witches or zombies, all the students, human or monster, have one thing in common: they are kids and they are here to enjoy the vacations!