Aimed squarely at the teen market, this vehicle for High School Musical heart-throb Zac Efron is a body-switch comedy that blends Big, Freaky Friday, Back to the Future and even It's a Wonderful Life. Mike O'Donnell (Matthew Perry) is a walking disappointment, overlooked for promotion, ignored by his teenage kids and thrown out by wife Scarlett (Leslie Mann) - it was their shotgun marriage in 1989 that ended Mike's promising future in basketball. But some hokily convenient business with a magic janitor on a bridge transforms him back into his 17-year-old self (Efron), and he re-enrols at high school. The scenarios that ensue are predictable and undynamic - his own daughter comes onto him, he defeats the school bully with distinctly adult logic - and while Efron has charm, Perry is all-too-briefly on screen, so it's down to nerdy best friend Ned (Thomas Lennon) to supply offbeat comic substance. And, despite one shoehorned-in opportunity, Efron fans might miss his singing and dancing.

On the brink of a midlife crisis, 30-something Mike O'Donnell wishes he could have a "do-over." And that's exactly what he gets when he wakes up one morning to find he's 17 years old again. With his adult mind stuck inside the body of a teenager, Mike actually has the chance to reverse some decisions he wishes he'd never made. But maybe they weren't so bad after all.