• by Sarah Mahoney  @mahoney_sarah, September 12, 2011

Hang onto your flux capacitors, kids: Nike says it is finally selling the shoes that "until now, have only existed on the feet of Marty McFly."

The Beaverton, Ore.-based Nike is auctioning off 1,500 pairs of the footwear first seen in "Back to the Future II" in 1989, with proceeds going to benefit the Michael J. Fox Foundation and its fight against Parkinson's disease.

The Nike MAG shoes rely on an "electroluminescent outsole, space-age materials and a rechargeable internal battery good for 3,000 hours," brags the foundation's Web site. "And while they are not recommended for playing sports, these highly limited shoes will very likely command attention wherever they are worn."

The 10-day effort, which launched last week, will raise funds by auctioning off 150 pairs of shoes per day on eBay, with all net proceeds going directly to the foundation.

"We wanted to translate the excitement people have for the 'greatest shoe never made' and for 'Back to the Future' into positive action," says Mark Parker, Nike CEO -- who was on the 'Back to the Future II' set in 1988 when Fox donned the original Nike MAG shoes -- in the company's release. "But the long-term objective is to raise awareness so the foundation can achieve their goal of eradicating Parkinson's disease."

"BTTF" executive producer Frank Marshall also got involved, creating a "lost scene," filmed by Nike ad agency Wieden + Kennedy. Original cast members Christopher Lloyd and Donald Fullilove reprise their roles, and basketball star Kevin Durant, who plays for the Oklahoma City Thunder and is a Nike athlete, plays a customer.

Shoes insiders may like the spot even more knowing that the sales manager is played by the shoe's original designer, Tinker Hatfield, who is now Nike's VP/Design. (He gets to tell Lloyd that he has landed in the wrong year, and that power lacing won't be available until 2015.)

"This project is exciting to me because it brings together three very passionate audiences: the Parkinson's community, sneakerheads and 'Back to the Future' fans," says actor Michael J. Fox in the company's release. "With their support, we can accelerate our objective of finding a cure for Parkinson's."

Fox, who plugged the futuristic kicks on "Late Night with David Letterman" last week, was diagnosed with Parkinson's in 1991, disclosed his illness in 1998, and started the foundation in 2000.