A new Red Sox documentary about the 2004 World Series team will air later this month, ESPN announced Monday.

A three-part series titled “ Believers ” will air on Sept. 26 on the ESPN App for subscribers to an ESPN Unlimited plan.

“Believers: Boston Red Sox tells the story of how, for 86 years, the Red Sox broke the spirits of generations of their most devoted followers, falling short of a championship in heartbreaking and unforgettable fashion, time and time again,” the YouTube of the official trailer description said . “Yet through every collapse, every missed chance, and every season of disappointment, Boston fans held on to an unshakable belief that redemption would come.”

The documentary is produced by Ben Affleck , who was raised in Cambridge.

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