Adam Shankman's adaptation of the Broadway musical (itself an adaptation of John Waters' 1988 original movie) stars John Travolta, Queen Latifah and Nikki Blonsky.
Teen Tracy Turnblad's (Blonsky) regular cultural highlight is a local television music and dance programme called The Corny Collins Show. And, like all her friends, she dreams of having a chance to appear on it.
However, this is Baltimore in 1962 - and Tracy's both overweight and, worse, has liberal attitudes to race relations, which don't sit comfortably with the segregationist views of the show's producer (Michelle Pfeiffer).
But, could Tracy's ambitions for not only appearing on the show, but also racially integrating it, receive a fillip when she meets the son of Motormouth Maybelle (Latifah), host of the monthly 'Negro Day' edition of the show?
Also starring John Travolta (in drag and a fat-suit) as Tracy's mum, Christopher Walken, as her dad, and Amanda Bynes, James Marsden, Brittany Snow, Zac Efron and Elijah Kelley; plus cameos from the star of the original movie, Ricki Lake, and its director, John Waters.