Frankie tells the kids what she wants for Mother's day so one of them can clue in Mike; after repeatedly failing the driving test, Sue feels resentful when her friends get their licenses; Axl receives stunning news from Cassidy.

Mike tries to help after Frankie doesn't get a response to her texts to Axl, Sue gets an unexpected visit from Darrin, and Brick and his fellow classmates are afraid to use the school bathroom.

During the Orson Centennial parade, Mike and Frankie volunteer to drive a float, Sue tries to make Darrin jealous, Axl tries to make some money, and Brick is upset over his town slogan not being chosen.

Frankie and Mike start to worry when Brick begins developing irrational fears. Sue is conflicted about Derrick Glossner's behavior. Axl and Sean shut down Darrin's attempt to start a Boss Co spinoff.

Sue enters a contest to win a car; Mike and his brother bond on a road trip to Chicago for Brick's spelling bee; Frankie goes to Axl's dorm to help him find a missing desk.

Mike accompanies Sue on a college tour weekend. Frankie leaves Brick with babysitters and a school project while she goes to watch Axl play in his first college football game.

A case of disrespect hits the Heck boys when Axl -- who is celebrating his milestone 21st birthday -- refuses to come home and help Mike move an old freezer, and Brick begins turning into a mini-Axl by dissing Frankie with a bad attitude. Meanwhile, Sue is torn over what to do when the manager of Chop Suey USA tries to woo her away from her job at Spudsy's.

Frankie and Mike struggle to stay awake when watching a movie during a cozy date night at home. Meanwhile, a handsome mall employee asks Sue to her senior prom and Axl and Brick hope to find success with a barbecue sauce they've created.

Sue discovers that she's too poor to keep up with her new roommate's spending habits, Axl discovers that befriending the boss isn't what it's cracked up to be, and Brick could lose his only two friends when he becomes a director.

Frankie's plans to have a peaceful backyard lanai are ruined by her new neighbors' loud children. Axl and Hutch begin a new food business on campus. Sue and Lexie make plans for next year after they win the dorm lottery.