Steve undergoes an image makeover in order to take part in a kissing auction hosted by Laura's sorority; Carl feels threatened by Hariette's promotion and raise and decides to moonlight as a parking attendant.

When Commissioner Geiss and Carl go on a duck-hunting excursion, Urkel shows up at the lake with a camera to ""shoot"" the ducks. Urkel is shocked and dismayed to discover that Geiss and Carl are actually trying to slaughter innocent feathered fowl. Meanwhile, Kelly ""borrows"" her mom's diamond earrings for a hot night out at the Sizzle Club and comes home an earring short.

When Myrtle ends up hospitalized after saving Eddie from being hit by an oncoming car, he promises to take her to the debutante ball. Myrtle is thrilled when her Prince Charming, Eddie Winslow - ""the gravy on her biscuits,"" escorts her to the Biloxi Debutante Ball. Meanwhile, Laura disappoints Carl when she goes to the Sizzle Club in a skimpy dress after agreeing to change into something less revealing.

Goody-two-shoes Laura has her first beer---and her second and third---at a fraternity party, where she's later rescued by a gallant Urkel. Meanwhile, Carl and Harriette keep their anniversary plans a secret from each other, but not from Eddie, who finds himself in the middle of their fight. When Urkel arrives at a fraternity party to discover a drunken Laura dancing on tables, he takes her home and she kisses him passionately. The next morning when Urkel proclaims that the kiss ""was the kind that changes things forever,"" Laura protests that she doesn't remember - but does she? Meanwhile, Carl and Harriette's wedding anniversary turns into a bone of contention when they both make elaborate - but very different - plans.

Unbeknown to Urkel, Laura has given him Eddie's Little Black Book to use as an invitation list to Eddie's 21st birthday party, and all of ex-girlfriends show up. While Eddie isn't having a happy birthday party surrounded by his exes, Carl is promoted to police captain after proving to Commissioner Geiss that he is the one qualified for the job, which Geiss had initially given to his son.

Urkel doesn't mind at all when a chemistry experiment allows him to eavesdrop on the thoughts of everyone around him, but being able to hear what people are thinking soon becomes far too overwhelming. Meanwhile, Carol becomes a troop leader for the Junior Woodsmen.

Stevil, the mischievous ventriloquist dummy, is back to haunt Urkel, but now he's brought along a nightmarish sidekick, Carlsbad. Together Stevil and Carlsbad attempt to take over the souls of Urkel and Carl - wreaking havoc on the whole Winslow household.

When Laura seems distant and distracted, a jealous Stefan cooks up an elaborate plan to swap places with Urkel - the ""man"" to whom he suspects Laura is attracted. Laura knows something's up when Stefan (as Urkel) is a miserable tutor and Urkel has a heck of a time filling in for Stefan at a fashion photo shoot. Meanwhile, Eddie decides to follow Carl around on ""the beat"" with a video camera.

Steve gets a chance at a $1 million basketball shot. Will he end up rolling dough, or will he get ""nothing but net""? Harriette's new boss has a reputation for being tough, but his employees are blindsided by his verbal abuse as well. Meanwhile, Urkel tries to win a million dollars with a basketball half-court shot in L.A.

Jaleel White dons another persona, that of Urkel's visiting hip-hop cousin, O.G.D. (short for Original Gangsta Dawg), who makes a bad first impression on the Winslows - hitting on Laura, spouting controversial ideas, and influencing 3J in a decidedly negative fashion. Meanwhile, a crooked thug who is owed $4,000 by O.G.D. arrives in town looking to collect on the debt. Singer Missy ""Misdemeanor"" Elliott has a cameo.

Steve gets all wrapped up in the Christmas spirit when he takes a job as a gift-wrapper, but the new gig leaves him little time to spend with Myra; Carl plays Santa at the mall and appoints Laura to be his elf; a disappointed Richie learns that his mom won't be with him for the holidays.

Everyone duck! Urkel begins training to become a master teppanyaki chef at a Japanese steakhouse a part of his journey along the self-improvement highway. Laura surprises Urkel at the restaurant while he's slicing and dicing, and he lives up to the specialty of the house - The Tsunami Supreme. Meanwhile, Commissioner Geiss goes on vacation and leaves his talking pet parrot, Andre, in Carl's care and the bird learns some new words: ""Geiss is an idiot.""

Urkel decides to call it splitsville with Myra, but freaks out when she beats him to the punch. Although he is surprised that Myra broke up with him, Urkel decides that it's all for the best and goes to his true love, Laura. But when Myra turns up at the Winslows claiming that she made a mistake and wants ""her man back,"" she discovers Urkel and Laura in a passionate kiss. Meanwhile, Eddie quits school and decides to become a police officer - just like his dad.

Urkel is shocked to discover that Myra has been spying on him, but he thinks she's really snapped her cap when she starts dressing like Laura. Meanwhile, Harriette discovers that her wedding ring was originally intended for another woman.

Cousin Myrtle dukes it out in the boxing ring with Greta to win Eddie for her own. Meanwhile, 3J longs to find his birth mother.

Eddie gets a new apartment but Carl overstays his welcome. Meanwhile, Laura goes to the biggest polka fest with Steve only to find out he has done a lot in the community through polka, and has become more attracted to him.

Laura's not impressed by Maxine's rich new boyfriend D'Andre.

Myrtle Urkel tries for the last time to get Eddie. This time, Laura and Maxine give her a complete and total makeover. Myrtle comes out looking terrific, but Eddie still does not like her. So she decides to stop chasing him.

Urkel asks Carl for Laura's hand in marriage, but Stefan has already given Laura a ring.

The first of a two-part series finale sends Urkel into space, which means he'll have to postpone his marriage to Laura.

In the conclusion of the series finale, astro-nerd Urkel's life hangs in the balance when he takes a dangerous walk in space to patch the damaged spacecraft.