Walter and Emily's daughter Megan arrives for a visit after being dumped by her latest boyfriend. She spends the day with Zack and Hartley—and Zack comes home with a tattoo.

Walter becomes jealous when the professor for whom Emily is doing volunteer works asks her to accompany him on a trip.

After an unpleasant evening with the Nelson, a new couple in town, Walter and Emily flee the next evening, leaving Zack home alone.

Emily is understandably upset to discover that her wedding ring stone is glass, but Walter is even more upset: he paid for a diamond.

Zack's mother Ginny visits with Zack's destructive half-brother Andrew, but Zack keeps quiet about the damage in hopes his parents will reconcile.

Emily is not pleased to discover that Walter and his friends have gone to see an old-time stripper; Zack is depressed because Hartley is moving away.

Chaos ensures when Emily's sister visits the Collins house.

After Emily successfully sets up a blind date for Matt, Walter points out that if Matt gets married they will have to move out.

Walter passes on to Zack the prized 1932 Ducky Medwich baseball card he inherited from his father, now worth $1,200.

Emily is upset when Walter buys twin beds so he can sleep better; in the ensuing fight, Matt throws them out of the house and they wind up in a motel.

Emily refuses to let Zack go jet skiing with Hartley and sends him on a ""safe"" trip to watch a tennis match with Matt—where Zack gets hit in the face by a racket.

Zack wants to go to London with his soccer team, but Matt stipulates he'll have to earn the fare himself. Walter gets Zack a job at the coffee shop, but the owner soon demands that Walter fire him.

After Zack complains of being bullied at school, Walter teaches him how to box—and Zack is immediately suspended from school for fighting.