2015 (MMXV) was a common year starting on Thursday of the Gregorian calendar, the 2015th year of the Common Era (CE) and Anno Domini (AD) designations, the 15th year of the 3rd millennium and the 21st century, and the 6th year of the 2010s decade.
In the time travel film Back to the Future Part II, Doc Brown, Marty McFly, and Marty's girlfriend Jennifer Parker travel to October 21, 2015 to prevent Marty's son from being arrested.