didn't the show end with Urkle going off to space
213 20 "Pop Goes the Question" Joel Zwick David W. Duclon & Gary Menteer July 3, 1998
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Carl tells a fellow police officer about Laura's engagement. Both Steve and Stefan propose to Laura. Her past adventures with both the nerd and the one-time "man of her dreams" are replayed through flashbacks (Steve in "Marriage 101," and Stefan in "We're Going to Disney World"). Laura is conflicted between the two, and when Steve feels Stefan is better, he plans to move to Russia to be with his parents, but Laura stops Urkel when she realizes she couldn't live without him, and tearfully accepts his marriage proposal, saying that she is sure that he is the one for her, a promise which the two seal with a kiss.
Note: This episode marks the final appearance of Stefan Urquelle.
214 21 "Lost in Space (Part 1)" Joel Zwick Gary M. Goodrich &
Timothy Stack July 10, 1998
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After
NASA buys the patent to one of Urkel's inventions, he's sent into space with a pair of astronauts to test it out. However, Steve's invention unintentionally causes a nearby satellite to crash into the space shuttle, and before long he sends himself hurtling through outer space. Meanwhile, Harriette (worried for the well-being of rookie officer Eddie) demands to have him assigned to giving out tickets for parking meter violations.
215 22 "Lost in Space (Part 2)" Joel Zwick Gary M. Goodrich &
Timothy Stack July 17, 1998
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NASA struggles to recover its astronauts and save Urkel's life. However, all ends well, and Steve returns to Earth a national hero. Meanwhile, while on meter duty, Eddie finds himself in the middle of a shootout. Eddie survives thanks to the lucky bullet-proof vest that Carl gave him. During that time, Carl and Eddie help Harriette realize that the job is dangerous and she needs to support them no matter what. Steve sees Laura at the end of the episode and says "You get more beautiful every time I see you." Laura then says she will kiss him only on one condition, Steve will have to promise to "never go into outer space again." Steve replies with "Only when we kiss, Laura Lee, only when we kiss" and they do, with a final applause from the audience.