Coldplay at Glastonbury

Michael J. Fox, 63, joined Coldplay onstage to play guitar during the band's Glastonbury festival performance on Saturday. Chris Martin took a moment to thank the "Back to the Future" star, who has Parkinson's disease and performed in a wheelchair.

Michael J. Fox Reflects on “Mind Blowing” Performance With Coldplay at Glastonbury. The actor and Parkinson's activist joined the band onstage at the U.K. music festival on Saturday night, playing guitar on the hit "Fix You."

Michael J. Fox makes surprise appearance with Coldplay at Glastonbury Festival. It was a blast from the past when actor Michael J. Fox made a surprise appearance at the Glastonbury Festival, playing guitar during Coldplay's "Fix You."

Footage from the event shows Fox — in a wheelchair but still able to play guitar and kick out his legs — performing the superband's hit Fix You alongside singer Chris Martin.