As Urkel tweaks his transformation chamber to enable him to be Stefan all the time, Carl begins complaining about his eyesight. Instead of going to the opthamologist (per Harriette's recommendation) to have his eyes checked, he asks Stefan to allow him to use the transformation chamber to fix his eyesight. However, Myra is starting to miss Urkel and tampers with the machine. However, Stefan isn't in the machine, and Myra finally realizes what she has done when Carl Urkel steps out!
While Stefan repairs the transformation chamber, Carl spends the next few days walking a mile in Urkel's shoes, wreaking havoc on the Winslow household. Eventually, Carl is changed back and decides Harriette's advice was best heeded. Stefan, meanwhile, changes back into Urkel at the end of his dinner date with Laura.
A college jock invites Eddie to join a college fraternity - under one condition: Tell the nerd (Urkel) to get lost. Eddie agrees and kicks Urkel out of a party. Laura realizes Urkel is really distraught and makes her lame-brained brother realize how important their friendship is. Eddie realizes Laura is right and tells the frat brothers to get lost.
When a Halloween-night storm cancels trick-or-treating, Urkel cheers up a disappointed Richie by playing Pass the Ghost Story. Everyone takes turns telling a story about 19th-century vampires (Carl and Harriette) licking their chops over the wayfaring Sir Steven (Urkel).
Carl is in a dilemma in whether he should tell Captain Savage to stop cheating or tell Steve Urkel off. Meanwhile, Maxine sets Laura straight for her ungrateful and selfish attitude towards her mother.
Hydrophobic Urkel has two choices: Pass a required swimming test in gym class, or fail and not graduate from high school. Urkel decides to enlist (who else) Carl to help him learn to swim, to predictable results.
The pilot of a chartered flight Carl and Urkel are on to Detroit is an ex-convict that Carl busted several years ago. The pilot sees his chance for revenge by bailing out. Carl and Urkel are forced to land the plane ... and neither one of them have the slightest idea of how to fly.
Richie upsets the family when he brings home a guest for Christmas: a homeless man. However, the homeless man has several lessons to share about the meaning of the season. Meanwhile, Urkel searches the landfills high and low for Laura's beloved childhood doll, which Eddie accidentally discarded.
Andre is one of Urkel's classmates who delights in bullying the nerd. But when Urkel learns that Andre is seriously ill with leukemia, the nerd decides to set aside the past and stage a bone marrow drive to save Andre's life.
Eddie decides he has no time to join with Carl in some father-son activities ... but Waldo is more than willing to have fun with Carl. Eddie realizes he is missing out and gets the hint. Meanwhile, Urkel creates another alter-ego - Bruce Lee Urkel - when a gang of ruffians harasses Laura at a longshoreman's bar.
Elvis Urkel is in the transformation chamber! At least that's what happens when Urkel, trying to impress a recruiter from MIT, demonstrates his transformation chamber. He turns into "The King" instead of Albert Einstein-Urkel, scaring the recruiter right out of his blue suede shoes.
Carl is assigned to guide Richie's class on a tour of the police station. The tour isn't going so well, until a robbery suspect gets free and holds one of the children hostage. Carl makes good on his opportunity to diffuse the situation, and impresses the youngsters. Meanwhile, Myra thinks Urkel and Laura are sneaking around together when they keep mum about their whereabouts ... only to learn they were planning a surprise party for her birthday.
Urkel witnesses a robbery and the suspect, aware he has been spotted, threatens the nerd if he reports the crime. Carl offers to be his bodyguard ... a decision he may regret. Meanwhile, Eddie begins dating Greta, whose overbearing father is his boss.
Highlights of the series' first six years - mainly, the Winslows' experiences with Urkel - are featured in this clip show, when Carl, Eddie and Laura visit with a psychiatrist to air their grievances over the nerd. Harriette reminds them that, while Urkel is annoying, he also has helped them many times.
Urkel wins a trip to Disney World, where he and the Winslows demonstrate his transformation chamber. There, the nerd changes into Stefan and proposes to Laura. Eddie decides to go later and gets Waldo to take him ... if only he can read a map.
Urkel's parents announce they are moving to Russia - only, they say so after they've left. Urkel is forced to move in with Eddie and Waldo, but those arrangements are only temporary thanks to the nerd's hungry termites. Carl sees that Urkel now has no place to go and (grudgingly) allows his comic foil to move into his house.