He is best known for his villain roles such as his role as Johnny Lawrence in 1984 's The Karate Kid .
William Zabka -- William Michael Zabka is an American actor , screenwriter , director and producer .
William Zabka is best known for William Zabka 's villain roles such as his role as Johnny Lawrence in 1984 's The Karate Kid .
William Zabka -- William Michael Zabka is an American actor , screenwriter , director and producer .