Michael J. Fox and Joan Jett at his 2011 Parkinson's benefit in New York City.

More than two decades after Marty McFly wowed Hill Valley High School with “Johnny B. Goode,” Michael J. Fox revived his “Back to the Future” performance in real life.

On Saturday night at his annual A Funny Thing Happened On The Way To Cure Parkinson’s benefit, Fox grabbed a guitar and took the stage with Joan Jett to perform the Chuck Berry classic that he “played” in the first “Back to the Future” film. In the movie, Fox mimicked playing the music; on Saturday, he did the strumming and singing.

Fox, 50, was diagnosed with Parkinson’s disease in 1991. He also rocked out at his 2008 benefit, taking the stage with Pete Townshend and The Who. ”This is almost worth getting Parkinson’s for!” Fox said at the time.