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

A space-age potion turns Urkel into Stefan Urquelle suave, smooth-talking life of the party, but Laura finds she soon misses the old Urkel.

Steve schemes to take the reluctant Laura to a hot-ticket concert; Carl takes out his frustrations on the family, unable to shake the memory of a shooting he feels he could have prevented in the aftermath of a hostage case.

A street gang causes trouble for the Winslows, and things become personal when they vandalize Rachel's Place and attack Eddie. Carl wants to take matters into his own hands, but Urkel decides to infiltrate the gang and tricking them into confessing.

Laura's guardian angel shows Urkel what it's like to be Laura.

Carl refuses to accept Eddie's story that he got pulled over for speeding ""because he was a black in a white person's neighborhood"" ... until the portly cop finds out the ugly truth. Meanwhile, Urkel tells Richie that he has nothing to fear when going to the dentist, but the nerd soon regrets his move when he has cavities of his own that need filling.

Myra rushes to Disney World, fearing something is amiss with Urkel. And it's no Mickey Mouse worry: he's proposed to Laura by the time Myra arrives.

The NBA's Larry Johnson plays Grandmama (his TV-ad alter ego), who becomes Urkel's new partner in a city basketball competition after Eddie dumps Urkel for star player Kenny.

At the drive-in movie, Laura's new boyfriend (Kevin Mambo) has trouble getting the message that no really means no; and at home, Carl just doesn't get it when his insults drive Harriette to retaliate.

Richie brings home a homeless person on Christmas.

The school prom brings one disaster after another for Laura. First her date cancels, then she's paired with the walking disaster Urkel at the dance, where the group Immature performs.

Urkel discovers that "I can clone stuff!"--which means double trouble for the Winslows.

For a class project, Laura is "married" to Steve for a day. Meanwhile, one of Carl's sergeants casts his eye on Rachel.

A charming, mysterious figure, claiming to be a family friend from the past, comes to visit - and turns out to be Harriet and Rachel's long-lost father.

Myra enlists Laura's help in snaring "hot stuff" Urkel; Eddie asks Carl a lot of questions after buying a hot car stereo.

When accident-prone Steve is blamed for a chemistry lab explosion, Laura represents him at a school trial.

Carl bribes Laura to go bowling with Urkel and dreams that they are married with four kids who look like Urkel.

Urkel's accident-prone Aunt Oona visits shy, dowdy woman who get a confidence-building makeover from Harriette and then takes her new-found confidence to a karaoke bar, where chaos erupts when she holds a singing contest.

Laura doesn't want Stefan to change anything about himself for her, while Urkel - as his nerdy self - is a 10 in Myra's eyes. Meanwhile, hoping to improve his vision, Carl steps into Urkel's transformation chamber.

After a vengeful Myra tampers with Urkel's transformation chamber, Carl steps into it and steps out as an Urkel-like nerd.

After failing to foil a robbery, Carl is assigned to protect Urkel, who stopped the thief; the boss's daughter comes on to Eddie.

As a finalist in a contest, Urkel invites the Winslows on his trip to Disney World, where Laura has a fantasy romance---with Stefan Urquelle.

To avoid being banished to Russia (where his parents are moving), Urkel--and his termites--move in with Eddie and Waldo.

Laura wants to go to an upcoming dance with a good-looking boy. Carl and Eddie try to find Laura a date. Carl asks Steve Urkel to take Laura to the dance, while Eddie asks one of his friends to take her out. When Laura finds out what happened, she is humiliated.

Steve develops a crush on Rachel and believes it is reciprocated when she invites him to a candlelight dinner at her restaurant, while Rachel is actually dating her bank's loan officer.