The concept of someone returning to his or her youth has gotten many movie workouts, and this latest, reasonably amusing variation casts "High School Musical" idol Zac Efron as the younger incarnation of a man – played by Matthew Perry ("Friends") – who isn't satisfied with the way his life has turned out.

Suddenly, he's young again, and he struggles to readjust to high-school life knowing all he's learned as an adult. Thomas Lennon ( "Reno 911!"), Leslie Mann and Michelle Trachtenberg also appear. *** (PG-13: AS, P) (Also on Blu-ray)

Buy '17 Again' on DVD.