Stefan Urquelle is an alternate identity created by Steve Urkel. Initially an alter ego residing in Urkel's mind and DNA, Stefan was given his own form when Urkel cloned himself. He was portrayed by Jaleel White. During the fifth season episode "Dr. Urkel and Mr. Cool," Urkel devised the ultimate plan to win Laura's heart: transforming his DNA using a serum called "Cool Juice" to suppress his "nerd" genes and bring out his "cool" genes. This resulted in the alter ego known as Stefan…
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