It's Christmas Eve and a huge blizzard has just shut down the airport, threatening to ruin holiday plans for all stranded travelers. Snowed in en route to their father's house, two "Unaccompanied Minors"--dubbed UMs--Spencer (Dyllan Christopher) and his little sister, Katherine (Dominique Saldana), are ushered to the airport's Unaccompanied Minors Room, a holding cell for dozens of stranded, parent-free kids from all over the country. Caught in the crossfire of projectile cupcakes and juice boxes and desperate to escape, Spencer makes a run for freedom along with four other UMs, who couldn't be more different if they tried: spoiled rich girl Grace (Gina Mantegna), trailer-park tomboy Donna (Quinn Shephard), academic overachiever Charlie (Tyler James Williams) and comic-book geek Timothy Wellington a.k.a. "Beef" (Brett Kelly). With the airport's peevish Passenger Relations Manager Oliver Porter (Lewis Black), his lackey assistant Zach Van Bourke (Wilmer Valderrama) and every airport...