Vietnam – The Clearys feel conflicted when Lawrence and Eddie are drafted to serve in the Vietnam War. Although Eddie and Lawrence try to avoid going, they come to terms with their fate, but the events of the day weigh heavily on Peggy and Mike. Though they are both proud, Mike and Peggy take matters into their own hands and try to derail Lawrence and Eddie’s decision to serve their country.
Mailbox – Eddie becomes distraught when Wendi breaks up with him over disagreements on how they want to handle their future. Meanwhile, Mike struggles to address Eddie’s heartbreak, and Peggy contemplates whether she has to break up with Wendi too. To complicate things further, Joey convinces Frank to send Wendi a love letter, pleading his case as to why she should be his girlfriend. With Frank’s impending humiliation on the horizon, the Cleary boys try to help him retrieve the letter.
Show Boat – Against Peggy’s wishes, Frank secretly helps design a set for a musical in which Timmy is performing. Feeling jealous of all the positive attention Frank is getting for his work, Timmy devises a plan which forces Frank to admit his involvement on set, but Timmy’s scheming backfires. Meanwhile, Mike grows increasingly concerned that Joey is heading down a shady moral path with all his wheeling and dealing, and decides to teach him a lesson.
The Love List – The Cleary boys want Peggy to tell them she loves them after seeing how loving Pat’s friend’s parents are. Playing on their insecurities, Peggy posts a ranked list of their names on the fridge in the hopes that it will bring out their competitive instincts, and someone will divulge who broke the dining room light fixture. Charged with several emotions, Timmy incriminates his brother but feels so guilty that he gets a horrible stomachache and heads to the hospital.
Christmas 1972– Mike oozes with jealousy when Peggy’s successful brother Tom drops in for Christmas. After Tom gives the Clearys an extravagant Christmas gift, pride prevents Mike from taking it—putting him at odds with the rest of the family. Meanwhile, Timmy mistakenly receives $100 from his great-aunt for Christmas and contemplates whether he should do “the right thing” or keep it. Elsewhere, Eddie forgets to get Wendi a Christmas present and panic sets in.
”Little Cyst-Mike and Peggy think they may be expecting again, but Peggy is diagnosed with having a cyst instead. The experience launches them into a debate about whether or not they should have another child. Meanwhile, the kids spy on Mike and Peggy to try to figure out what all their unusual behavior is about. When Pat overhears that they are going to have a little sister, the Cleary kids decide to dig deeper and continue their investigation, which only leads them on a downward spiral.
Behind the Counter-Mike comes to the conclusion that Eddie is being sexually active and takes it upon himself to give him enough advice to work things out. Later, Peggy disagrees with how Mike handled the situation and they argue over how much they should interfere in their children’s lives. Elsewhere, Joey and Timmy attempt to disrupt Frank’s plan to do free yardwork so that they can go back to getting paid.
Boxing-Frank announces that he has decided to compete in the church boxing tournament, making it obvious that he’s playing for Mike’s affections. When Frank can’t cut it, Timmy steps in and takes up boxing in order to bond with his dad and get his approval. Ultimately, he has to choose between his dad’s dreams for him and his own dreams of showbiz glory. Elsewhere, feeling rusty after being at the seminary for so long, Lawrence asks Eddie to help prepare him for a date.
Peggy’s Day Out-To hide a mess Eddie made, his girlfriend Wendi tries to distract Peggy by insisting she take a day off with a fun day out while they take care of the housework. To everyone’s surprise, Peggy accepts the offer and requests Wendi tag along, with the ulterior motive of teaching her a lesson. Meanwhile, Eddie enlists the help of his brothers to clean up and keep Mike out of the house while Wendi and Peggy are out. Elsewhere, Pat introduces Timmy to his secret dog.
Microwave-Mike introduces a new microwave to the Cleary household, but Peggy rejects it as she feels like it’s intruding into her domain. Fed up with his experimenting and nudging, she secretly sabotages his happiness. Meanwhile, eager to see “everything” exposed for the first time, Joey and Timmy go to extreme lengths to see Barbara Eden’s wardrobe malfunction on a Bob Hope TV special. Elsewhere, Lawrence trie to apply lessons from a psych class at school to psychoanalyze Mike and Peggy.