Fans at the Glastonbury Festival in the UK were in for a surprise as Coldplay took to the stage to perform. The popular band had a surprise guest who joined them to play a few songs on stage.

Michael J Fox joins Coldplay for a surprise performance at the Glastonbury Festival

Veteran actor Michael J Fox, the star of the iconic science-fiction movie Back to the Future, is going to open up about his battle with Parkinson's disease in a new documentary titled Still: A Michael J.

Still trailer: Michael J Fox opens up about Parkinson's disease in emotional documentary

Robert Zemeckis' 'Back to the Future' is considered one of Hollywood's finest blockbusters. It was an all-around fun adventure that has, unlike a lot of 1980s American films, has aged incredibly well.

Michael J Fox and Christopher Lloyd to reunite for fourth 'Back to the Future' movie?

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Michael J Fox joins Coldplay for a surprise performance at the Glastonbury Festival

Still trailer: Michael J Fox opens up about Parkinson's disease in emotional documentary

Michael J Fox and Christopher Lloyd to reunite for fourth 'Back to the Future' movie?