Teen superstars Mary-Kate and Ashley take sibling rivalry to a whole new level in their latest movie 'The Challenge', playing estranged sisters who are total opposites. Ambitious, uptight Lizzie (Ashley Olsen) and laid-back tree-hugger Shane (Mary-Kate Olsen) have to learn to live -and work - together as a team on a popular TV reality adventure show. A college scholarship is the prize at stake. Will the show's producers use sibling rivalry as a ratings tactic? Will this bring the girls closer or push them apart forever?