William Michael Billy Zabka born October 20 1965 is an American actor martial artist screenwriter and film producer Zabka is best known for his role of Johnny Lawrence in The Karate Kid 1984 The Karate Kid Part II 1986 and decades later reprises the role of Johnny in the Netflix series Cobra Kai 2018 along with Ralph Macchio as Daniel During the 1980s Zabka appeared in the comedy movies Just One of the Guys 1985 and Back to School 1986 Zabka also costarred on the CBS television series The Equalizer as the son of the title character 198689 He also played Jack Audreys jock boyfriend in National Lampoons European Vacation 1985 During the 1990s and 2000s he acted mostly in independent films while studying to be a filmmaker In 2003 he wrote and produced the short film Most shot on location in the Czech Republic and Poland Most aka The Bridge had its world premiere at the Sundance Film Festival 2003 and won numerous awards at prestigious film festivals including Best of Festival at the Palm Springs International Festival of Short Films in 2003 In 2004 he was nominated for an Academy Award for Most in the Live Action Short Film category