A suburban Chicago family is pestered by nerdy, nosy neighbor Steve Urkel in this long-running spin-off of 'Perfect Strangers' (Harriette Winslow was the wisecracking elevator operator at the newspaper where Larry and Balki worked). Originally, Urkel was a supporting character but he quickly emerged as a breakout star whose shenanigans came to dominate the sitcom.
Ranking Big Bang Theory's Guest Stars
From Stan Lee to Leonard Nimoy, check out the greatest cameos on the CBS sitcom
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