It was a normal day in Ninjago City, with our ninjas in the monastery since they were off duty lately since crime was no longer on the streets, even so, for the ninjas the day was long and boring without any villain to battle, they just trained and that's it One afternoon, an explosion was heard behind the monastery, the ninjas quickly came out ready for action if it was something dangerous

Kai: "Wait, what is that?" Lloyd: "They are..." Jay: "...kids! They are kids!"

and it's true, in the explosion area there were children... certainly similar to them