Plot summary
When Francis comes home for a post-Halloween visit, he helps his brothers get back into the holiday spirit by building a giant slingshot on the roof of their house to terrorize the neighborhood. Soon they are defeated when several "Krelboynes"—the kids that attend Malcolm's genius class at school—fight back. Hal and Lois track down a joyrider in a blue 1972 Chevrolet Chevelle who is constantly speeding down their street and taunting them, but they end up stealing his car. They think about leaving their lives and escaping to Mexico, but they ultimately come to their senses, drown the car in a lake and return home.
Credits
Adapted from Wikipedia contributors, Malcolm in the Middle season 2. HTML formatting and reference markers removed.