WATCH: Why Sam Rockwell, Toni Collette, Allison Janney Got Cast In 'The Way, Way Back' (VIDEO)

Steve Carell plays beautifully against type in 'The Way, Way Back' - a gentle coming-of-age tale, familiar to anyone who's been on an extended-family holiday.

After being dragged on the trip with his mum Pam (Toni Collette) and her overbearing boyfriend Trent (Carell), 14- year-old Duncan finds a gregarious friend called Owen (Sam Rockwell) at a local water park. The two form a powerful bond as Duncan learns to swim through the challenges of life, love, family and friendship, resulting in a vacation he’ll never forget.

Even with Carell and Collette in starring roles, it's Sam Rockwell and 'West Wing' star Allison Janney who steal the show.

'The Way, Way Back' is released today, 26 December, on Digital Download, Blu-ray and DVD from Twentieth Century Fox Home Entertainment. WATCH our Exclusive Clip below, including some revealing interviews with the producers as to how they chose their special cast...