Michael J. Fox (starred as Back to the Future's Marty McFly) will guest on David Letterman tonight to announce the release of the Nike Air Mag. (4 years ahead of Back to the Future's 2015 schedule).
1,500 pairs will be sold on eBay over the next 10 days with all net proceeds going towards The Michael J. Fox Foundation.
Tune in tonight at 11:30pm EST/10:30 CT.