For three pivotal years, Muhammad Ali and Malcolm X forged a brotherhood that would not only change both men but change the world. In the feature Netflix documentary Blood Brothers: Malcolm X & Muhammad Ali, director Marcus A. Clarke and producer Kenya Barris tell the story behind the friendship —and the ultimate falling out— of two of the most iconic figures of the 20th century. The film debuts on the streamer September 9.

The docu gives a fresh perspective of the pair via insider voices and never-before-seen footage. Blood Brothers chart this most complex of friendships, tracing the near simultaneous and symbiotic rise of the charismatic and outspoken Olympic champion who charmed the nation, and the ex-con-turned intellectual revolutionary who railed against oppression. Through interviews with those closest to them — Malcolm X’s daughter Ilyasah Shabazz, Ali’s brother Rahman and daughters Maryum and Hana — and cultural luminaries such as Cornel West and Al Sharpton, the film illuminates their meeting, bonding, and eventual falling out over discord within the leadership of the Nation of Islam.

Inspired by the book Blood Brothers written by Randy Roberts and Johnny Smith, the film is directed by Marcus A. Clarke (Unsolved Mysteries, Rapture), produced by Kenya Barris and Jason Perez and executive produced by Erynn Sampson, Jonathan Chinn, Simon Chinn, Simon George and Marcus A. Clarke.

Watch the trailer above and check out the poster below.