Zac Efron is an enemy of Chad Dylan Cooper and an un-seen character. He attended Chad's celebrity tennis game, which he won. Chad refused to except that he lost and whacked Zac Efron with a tennis racket on purpose. Sonny refers to him as "Mr. Efron". His rivalry with Chad is said to date back to when they co-starred in a film and Zac Efron was acting like a jerk. He is not a jerk at the tennis game, but he does win the game. He is a real-life actor, notable as the one who took the role of Troy Bolton in Disney's "High School Musical". Zac Efron was strictly banned from Condor Studios by Chad's request.