Johnny is an unemployed handyman with an estranged teenage son who resents him for his non-involvement in his life. Johnny resents Daniel, who is a successful businessman with his own car dealership, complete with commercials and billboards. Not only that, but Daniel is happily married with two kids.
When Johnny steps in and takes down a gang of teenage thugs who are beating up his young neighbor, Miguel (Xolo Maridueña), he comes to the conclusion that he should restart the notorious Cobra Kai dojo.
As Miguel trains with Johnny, he comes to the attention of Daniel's daughter, Samantha (Mary Mouser). Meanwhile, Johnny's son Robby (Tanner Buchanan) begins to work for Daniel and is taken under his wing, as Daniel teaches him karate and the philosophy he learned from Mr. Miyagi.