Ralph Macchio, the actor who has given life to the lead character in the Karate Kid franchise for over 30 years, is having the time of his life. The Netflix spin-off Cobra Kai is more successful than ever, and he is enjoying his return to the spotlight alongside William Zabka, who plays his longtime nemesis. But, as all good things must end, so must Cobra Kai. The OG Karate Kid star says the show has to end because it will lead into a new story.