Roxy (Mary-Kate Olsen) and Jane (Ashley Olsen) are identical twins from Long Island who rarely see eye-to-eye in their personal lives. On a Manhattan-bound train, the rebellious Roxy plans on cutting class, attending a rock video shoot, and presenting her demo tape to the band's manager. Meanwhile, the straight-laced Jane is heading to Columbia University, where she hopes to gain a college scholarship. Disaster strikes when the duo is dumped from the train, and a shady criminal places a microchip in Roxy's bag. Bennie Bang (Andy Richter) offers the twins a ride in his limo, but he is actually after the microchip they unknowingly possess. Fleeing his clutches, Jane leaves her precious day-planner in the car and a chase begins. Bennie is in hot pursuit, but so is Max Lomax (Eugene Levy) Roxy's truancy officer who is determined to catch the errant twin.