A whip-smart high school senior whose plans to attend the high school event of the year are spoiled when she gets stuck babysitting her little brother. Just when she thinks it can't get any worse, he disappears! Now, with the help of three unusual friends, she must find the little troublemaker before her mom discovers that he's missing. Together, they're in for a night filled with hilarious adventure and 'king-size fun' every step of the way.