Zac Efron is grateful for the High School Musical franchise. It made him a household name and the object of every teenage girl's affection. But the actor is also ready to movie beyond Disney, to establish himself as a legitimate, mature actor.

With that in mind, Efron is starring in 17 Again, a film opening this spring that's set up like Big in reverse: a married man (Matthew Perry) wakes up one day in the body of a teenager (Efron). Watch the movie's trailer now:

17 Again