When Peggy storms out of the house without explanation after a mishap at the grocery store, Mike enlists Wendi to help find her.
Timmy enters a contest to appear on a TV show and takes matters into his own hands when he doesn't hear back; Peggy takes a driving test to get her license.
Mike and Peggy are sympathetic when Wendi's parents split up until Peggy realizes that Wendi's parents left her in the house alone, leaving her and Eddie unsupervised; Joey goes under cover.
Mike and Peggy are stunned when they learn that Father Dunne has a girlfriend; Frank loses the church keys entrusted to him and must find them before anyone else does.
Peggy tries to trick Timmy into taking better care of his personal hygiene; Mike fears that Peggy's meddling is causing Timmy to develop insecurities; Timmy receives a Valentine's Day card from a secret admirer and becomes unnerved.
The Clearys feel conflicted when Lawrence and Eddie are drafted to serve in the Vietnam War; Mike and Peggy take matters into their own hands and try to derail Lawrence and Eddie's decision to serve their country.
Eddie becomes distraught when Wendi breaks up with him over disagreements on how they want to handle their future; Peggy contemplates whether she has to sever ties with Wendi.
Frank secretly helps design a set for a musical in which Timmy is performing; Mike grows increasingly concerned that Joey is heading down a shady moral path.
The Cleary boys beg Peggy to tell them she loves them; Mike invites a co-worker to help compel a confession from the child who broke the dining room light fixture.
When Peggy's successful brother drops in for Christmas, Mike feels envious; Timmy mistakenly receives $100 from his great-aunt for Christmas; Eddie forgets to get Wendi a Christmas present.
Mike and Peggy debate whether they should have another child; Pat overhears that he is going to have a little sister, leading the kids to dig deeper into the situation.
Mike comes to the conclusion that Eddie is sexually active and takes it upon himself to give him advice; Joey and Timmy attempt to disrupt Frank's plan to do free yardwork.
To hide a mess Eddie made, his girlfriend, Wendi, tries to distract Peggy by insisting she take a day off; Peggy accepts the offer and requests Wendi tag along, hoping to teach her a lesson; Pat introduces Timmy to his secret dog.
Mike proudly introduces a new microwave to the Cleary household; Lawrence attempts to apply lessons from a psych class at school to psychoanalyze Mike and Peggy.