After Brick attends a Bar Mitzvah and questions when he'll officially become a man, Mike attempts to help him become more responsible in his quest to manhood. Meanwhile, Sue exudes a little too much enthusiasm as she tries to flirt and find herself a boyfriend, and Axl and Hutch find themselves a new home in the form of a Winnebago.

After making some extra money from the diaper business, Mike surprises a rather unenthusiastic Heck family with a spring break vacation at Mammoth Cave, Kentucky. In the hopes of livening up what is perceived to be a lame vacation, Frankie suggests that the Donahues join them. While Mike visits all of the attractions on his own, Nancy asks a not-so-thrilled Frankie to speak with Sean to try and talk him into taking his MCATs; Axl enlists Brick to help him pick up women by playing "Jerk/No Jerk" - with Brick in the role of the "Jerk"; and Mike is anything but excited when an exuberant Sue reveals some news to him about her upcoming summer plans.