The Heck family learns about Darrin’s marriage proposal to Sue…as well as her response. Meanwhile, Axl attempts to use his intro to Psych class to cure Brick of all of his quirks and tics.
Valentine’s Day aims its sights on the Heck kids when a nervous Brick finds out that his quirky girlfriend Cindy wants him to kiss her on the special day, Darrin asks Frankie and Mike to help out with an exciting scavenger hunt he’s putting together for Sue, and Axl begins to question his girlfriend Devin’s request that he not give her anything for what she considers to be a lame tradition.
Upon learning that Aunt Edie has passed away, the Hecks board a train to South Dakota to take her to her final resting place.
Frankie must work at Ehlert Motors for one day in order to collect her pay on an old, uncashed paycheck, Mike offers Sue a part-time job at the quarry, and Mike’s dad attempts to persuade a lazy Axl to help replace the damaged kitchen sink.
Frankie acts like a teenager when she hangs out with Pam Staggs, a former classmate who was popular in high school. Meanwhile, Brick surprises Mike by winning an athletic award; Sue pursues some odd hobbies; and Axl seeks a date with Devin Levin.
Frankie loses her Christmas spirit, Mike unsuccessfully tries to exchange the new family Christmas tree, and a fight over Rudolph the Red Nosed Reindeer threatens to break up BossCo.
Mike accompanies Sue on a college tour weekend, and Frankie abandons Brick with a school project and a revolving door of babysitters while she goes to see Axl play in his first college football game.
With the Heck house in disarray due to the kitchen sink hole and miniature dining room table, Frankie suggests that the family enjoy a Thanksgiving feast at the local King’s Feast buffet. But all does not run so smoothly when Sue invites her boyfriend Darrin to dine with the family and gets the feeling that Mike doesn’t like him very much, Brick invites his quirky girlfriend Cindy, and Axl is forced by Frankie to invite a girl he doesn’t even know to the holiday meal.
The Heck house once again throws a curve ball to the family when the kitchen sink caves in and drops out of sight, causing Frankie to have to wash the dishes with the outside hose. Meanwhile, Sue is informed that, since Wrestlerettes does not qualify for P.E. credit, she needs to master tinikling — a difficult dance routine for a clumsy Sue — to get the credit she needs to graduate, and after Brick accidentally breaks Mike’s lawn mower, he takes Axl’s advice to try and play the hero card by taking his dad’s wallet then returning it later, thinking this will divert Mike’s attention away from the busted mower.
Frankie and Mike are surprised when Brick invites a girl over to the house to hang out; Sue tries to organize a screening of a holiday classic in a pumpkin patch; Axl is locked inside the library.