This is how you tell a story of the main characters doing heroic stuff. Basically they have great synergy and teamwork, leading to their glorious reputation among the school.
Max had a problem with the bullies' nasty actions to smaller kids, and when he saw what PJ could do to the bullies, them form a team to stop the school bullies so that the small kids will be saved. The bullies, headed by Mr. Big, won't let that happen, and had a plan.
Basically, the plan was to spoil the reputation of the heroes, something which every kind of hero faces because of a power struggle. Of course, they made it to the end.
It kinda gave away the whole episode, but the simple description won't do away with the whole episode, as there is more to it than what was already mentioned. Thanks for reading!