On a dark and stormy Halloween night the Winslows play Pass the Ghost Story, in which Carl and Harriette are 19th century vampires licking their chops over the wayfaring Sir Steven.
Myra makes a beeline for Walt Disney World, suspecting something is amiss with her "Steviekins". And it's no Mickey Mouse worry: as Stefan, he's proposed marriage to Laura.
Carl and Henriette send Laura off unchaperoned to cheerleading championships in Omaha, where Laura's handsome partner, Gary, looks a lot like trouble in Urkel's spying eyes.
After six years of Urkel-agony, the Winslows finally admit themselves into therapy where we look into the history of the chaotic effects that Steve has had on the Winslows.
Another transformation-chamber mishap turns Urkel into a gyrating Elvis with a hunka hunka lot of explaining to do during a meeting with an MIT recruiter.
Suspicions mount for Myra as Urkel and Laura put their heads together to plan a surprise birthday party for her. Meanwhile across town, Richie hopes to impress his classmates on a field trip to Carl's office at the police station.
Hard times bring distress for the unemployed Harriette and for a homeless and eccentric janitor, who gets trapped in the school bomb shelter with Good Samaritans Urkel and Carl.
Urkel learns the ringleader of a group who taunts him has leukemia. Meanwhile, Carl's common sense is outweighed by his excitement over what he perceives to be a great deal at a police auction.
Urkel needs Carl's help to pass a swimming test needed for graduation. Meanwhile, Richie gets Rachel into hot water with Harriette when he accidentally tears a new dress.
The transformation machine turns Urkel into a karate master who defends Laura's honor at a rough longshoreman's bar; Waldo becomes Carl's substitute son when Eddie starts taking his father for granted.
Urkel and Carl try to stop Mr. Looney from committing suicide when he is jilted on his wedding day; meanwhile at home, Laura fumes when her parents are more protective of her than of Eddie.
Duffer Carl is reluctant to stand up to his cheating boss during a round of golf, but Harriette isn't reluctant to go looking for Laura when she misses her curfew.
Capt. Savage isn't pleased when Carl tells him what he discovered about his girlfriend; and Eddie and Urkel cook up a lie about Waldo's midterm baking project, which they devoured.