Michael "Mike" Barnes is the tertiary antagonist of The Karate Kid, Part III. He is considered to be Daniel LaRusso's greatest foe. He is highly comparable to Johnny Lawrence from the first movie.
He was portrayed by Sean Kanan.
He was hired by Terry Silver to defeat Daniel in the All Valley Karate Championship, in exchange for 25% (later 50%) ownership of his new Cobra Kai dojos. It is shown that he is a highly skilled karate master. He proves to be far too much for Daniel (mostly because Daniel couldn't so much as land a single damaging blow to him until the end of the film). He constantly torments Daniel and tries his best to force Daniel into signing an application for the All Valley Karate Tournament (which Daniel chooses not to enter because he has no reason to fight). Later when Mike forces Daniel to sign up for the tournament, Miyagi trains Daniel for the event. At the tournament Mike (under Silver's instructions) toys with Daniel by scoring points and then losing them with penalties. Despite his situation, Daniel defeats him in a sudden death match with the kata that Miyagi taught him. His business deal with Terry Silver, John Kreese and the Cobra Kai is off and Cobra Kai is shut down for good.