The team enlists an old friend when a crime boss is murdered, triggering revenge killings across the island; MacGarrett and Danny work out details concerning their new restaurant venture.
34 years after losing the All Valley Karate Championship, Johnny Lawrence decides to reopen the Cobra Kai Dojo while his school adversary, Daniel LaRusso, runs a successful auto business.
Daniel is dismayed to find a new Cobra Kai dojo has been opened up. Johnny learns his dojo has to pass several safety requirements before he can actually start teaching.
Miguel helps Johnny advertise Cobra Kai on the web. Daniel agrees to chaperon at the Halloween dance so he can keep an eye on his daughter.
Robbie is in hot water with his father. Johnny plans to shut down Cobra Kai after Miguel is injured. Samantha and Kyler's relationship hits rock bottom. A vandalised billboard creates tension for Daniel.