By Season 3 of “Cobra Kai,” Johnny Lawrence (William Zabka) is nothing like the bad guy he played for roughly two hours and four minutes of the 2-hour, 6-minute 1984 movie “The Karate Kid.” This Lawrence is making mature dating decisions, volunteering to teach kids self-defense and dedicating pretty much every other waking hour to getting Miguel (Xolo Maridueña) to walk again. But real-life nice...

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