Cobra Kai Season 5 Cast REACTS to OG Star RETURNS! (Exclusive)

Ralph Macchio and William Zabka chat with ET's Will Marfuggi about 'The Karate Kid' stars Sean Kanan and Robyn Lively appearing on 'Cobra Kai.' Plus, Ralph and William react to whether they think the series will continue! 'Cobra Kai' season 5 premieres Sept. 9 on Netflix.

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