Good-hearted dreamer Larry Daley, despite being perpetually down on his luck, thinks he's destined for something big. But even he could never have imagined how big, when he accepts what appears to be [...]

Good-hearted dreamer Larry Daley, despite being perpetually down on his luck, thinks he's destined for something big. But even he could never have imagined how big, when he accepts what appears to be a menial job as a graveyard-shift security guard at a museum of natural history. During Larry's watch, extraordinary things begin to occur: Mayans, Roman Gladiators, and cowboys emerge from their diorama.