By Hannah Truby
Ice climbing, skyrunning, free soloing, BASE jumping—films about high-risk sports invite a certain voyeurism, and at their core lies a single, guiding question: Why in the world do people do this?
For filmmakers Peter Mortimer and Nick Rosen, however, that question has never been about spectacle alone. While some climbing films like Free Solo feel clean and surgical, their work at Sender Films—like The Alpinist and Valley Uprising—is looser, more cultural in scope, and equally interested in the feats themselves as in the human contradictions beneath them.
That same approach continues in their latest project, an up-close portrait of the late Dean Potter—a pioneering but polarizing climber, BASE jumper, and highliner often cast in extremes (“cosmic,” a “flawed genius”)—labels
The Dark Wizard seeks to complicate.
Across four episodes, the new HBO docuseries builds an intimate portrait of Potter—from soul climber to Valley dirtbag to sponsored athlete—tracing his ambition and high-risk ascents alongside the public controversies and mental health struggles that defined his life.
“We were really just trying to tell an honest story. That was the lodestone,” Rosen says. “We wanted to tell the truth, to hear from the people who knew Dean best, who cared deeply about him but also held him accountable.”
That tension becomes the spine of the series.
As one of climbing’s most contested figures, Potter’s legacy is defined in large part by public controversy, most notably his 2006 free solo ascent of Delicate Arch; his widely debated BASE jump from the Eiger in Switzerland with his Australian cattle dog, Whisper—circulated online as the “orld’s first wingsuit BASE-jumping dog”; and his illicit wingsuit flying in Yosemite, an activity banned in all U.S. national parks since the 1980s. Ultimately, wingsuiting—driven by a lifelong desire to fly—became his most costly pursuit, claiming his life in 2015.
But Potter’s reputation extends beyond these headlines. A pioneer in the climbing world, his legacy helped drive a radical reimagining of what mountain sports could be.
Dean Potter in Yosemite National Park, California. Photographed by Eric Perlman.
Chasing what he called the “cleanest line possible,” Potter pushed across disciplinary boundaries, most notably fusing free soloing and BASE jumping into “freebasing.” That approach foreshadowed a broader shift toward continuous, fast-and-light movement in mountain sports—later reflected in “ultra-alpinism,” popularized in part by athletes like Kilian Jornet.
Revered and contested in the climbing world, the series reveals an inner circle just as complex. Interviews with Potter’s family and friends, photographer Dean Fidelman, and fellow climbers including Alex Honnold and Hans Florine reveal relationships marked by ego, tension, and, at times, fracture. But even so, they remember Potter as someone of rare vision and ambition, who, at his best, was in pursuit of total alignment—“his insides matching his outsides,” as Rosen puts it.
But what really gives the project its weight is how fully it allows Potter to speak.
A dirtbag climber at heart; an artist wrestling with the ethics of sponsorship; a young man in love—Potter’s personal journals reveal a mind that is driven, obsessive, and often troubled, yet unmistakably relatable and deeply human.
Those journals, Rosen says, were “invaluable” to the project: “Mental health was kind of a ghost for him—an unidentified, untreated thing he was constantly battling. His journals open a window into that inner self. Part of him would be horrified to know they’re out there like that. But at the same time, I feel like he’d probably be like, fuck yeah—that’s who I was.”
In the series, adventure-sports filmmaker Eric Perlman suggests that, for people like Potter, “there’s something intrinsically beautiful when life is on the line—something evolution demands of us.”
Whether or not that holds true, Rosen resists such simplification.
“Dean suffered from undiagnosed, untreated mental health issues,” he says. “Risk became the only way he could find momentary peace—what his friend Brad calls his ‘only therapy.’ I don’t know if that’s evolution. It’s something far more specific than that.”
The Dark Wizard, too, resists simplifying Potter into either hero worship or moral judgment. Instead, it reveals a fuller portrait of the man himself—whose guiding impulse, in his most centered moments, was far simpler than either his reputation or his myth might suggest: to find momentary clarity and inner alignment, even if it meant risking everything.
The Dark Wizard debuts Tuesday, APRIL 14 at 9:00 p.m. ET/PT on HBO and will be available to stream on HBO Max. Subsequent episodes will debut Tuesdays at the same time.
