“Cobra Kai” (Netflix — season premiere, Jan. 8, 2021)

The former YouTube Premium series moves over to Netflix for its third season, which finds everyone reeling after a violent brawl between their high school dojos puts Miguel (Xolo Mariduena) in the emergency room fighting for his life. Ralph Macchio, William Zabka, Martin Kove, Mary Mouser and Jacob Bertrand are among cast returnees.