Ralph Macchio returns to 'Karate Kid' roots as movie is rebooted for YouTube series

Let's just get this out of the way first: The first "Karate Kid" movie is, undeniably, a sports movie. There's a karate tournament at the end, complete with a huge March Madness-style bracket. The fact that the first two-thirds of the film consist of teenage angst and probably dubious martial-arts...