朱尼与他的养父班和好如初后,在一位富有的单身妇人的资助下搬到了一座小城。而这个百万富婆不但讨厌小孩子,而且一心想与班结婚。所以朱尼只得重施故技,使出他十八般绝招,尽量破坏父亲的「好事」。侏尼不但大闹舞会与婚礼,更找到了一个比他还坏的小女孩,两人施展各种诡计,骗倒了所有大人,而这个小鬼又一心想撮合彼此的父母,想让他们坠入爱河……Junior's back in his first adventure since his last! Junior and Ben move to Mortville which seems like the perfect town to live in. The Healys have a nice new house--and Junior get's a cool new room! And young women have formed a line at Ben's door in order to get a piece of him (romantically). Ben does feel he should get remarried so Junior can have a mom, so while Junior adjusts to his new school which includes a little girl who's as bratty as Junior and a teenage brain-dead ignoramous bully in Junior's sixth grade class, Ben finds some dates, which Junior sends running for the hills, in the meantime Junior pulls his infamous tricks on people: blowing up barbecues, taping the bully to the chalkboard, videotaping his babysitter and her boyfriend having sex and broadcasting it for the whole neighborhood to see, same old same old. Meanwhile, Ben meets the gorgeous school nurse (after the school's satellite dish get's pushed on his head) and they, well he, believes it's love at first site, until he meets LaWanda Dumore, a greedy business women who wants to marry Ben and send Junior to boarding school--in Baghdad! So Junior and his new friend, Trixie, must get rid of LaWanda (any way possible!) to bring their parents together!