School's out for summer and Mr. Hat is missing, sending Mr. Garrison over the edge. The state's ban on the sale of fireworks screws up the boy's and the mayor's plans for the 4th of July celebration. The mayor settles for a snake, but not one of an ordinary size, they will have the biggest one in the world. Cartman takes swimming lessons, in the community pool where all the first graders usually pee. When the community's snake is lit, the result begins to take over the country. Meanwhile, Chef is vacationing on a tropical island; Mr. Garrison seeks psychiatric help from Dr. Katz and Jimbo and Ned go to Mexico, in an attempt to bring illegal fireworks back to the children of America.
Kenny dies when the snake knocks over the bleachers, which fall and crush him.