He won three consecutive world titles from 2002-04 and could conquer any wave. And while the documentary honours these moments the filmmakers, guided by Bruce and Irons' wife Lyndie, also shine a light on his darkest moments.
The night of his 21st birthday when he flatlined for eight minutes in Indonesia after snorting a line of morphine after bingeing on Jack Daniels.
How he went missing for three days immediately after his wedding. Or the time Lyndie found her "dying, heroin husband" laying on a mattress with no sheet or blanket "barely alive".
"His personality was filled with severe highs, lows and depression," Lyndie told People. "The opioids were really scary. I saw his whole life change — his body change, his face change — everything changed when he got addicted to opiates, and that was hard."
Irons was found dead in a Dallas hotel room on November 2, 2010. An autopsy revealed his heart had stopped because of a blockage in a main artery, but there were also traces of a cocktail of drugs, including cocaine and methamphetamine.
He had been attempting to travel back to Hawaii after an event in Puerto Rico but — as you hear him explain himself in a chilling voicemail left on Lyndie's phone — was unable to board the flight from Dallas because he was vomiting.
It stunned the surfing world — which certainly wasn't unaware of his problems — because it came during a period of his life where he appeared to be getting back on track.
But Irons was never able to kick the habit, which he used to self-medicate a lifelong battle with bipolar disorder, and no one was ever able to truly reach him.
The film isn't a finger-pointing exercise except when Bruce — who makes no secret of his own drug use — turns the spotlight on the brothers themselves.
"Everyone wants to blame somebody," he says. "They never want to accept the fact that me and my brother were big f***ing monsters. Believe it or not, we were manipulative in getting what we wanted, especially if it came to drugs. You know, you start getting into heavy f***ing addiction with these pills. I know that was ruling my life, and I know it was ruling my brother's life, too."