King of the documentary-makers Louis Theroux is to executive produce a feature-length documentary about YouTuber, rapper and boxer KSI for Amazon Prime Video.
The 90-minute film will follow the 28-year-old, real name Olajide "JJ" Olatunji, as he prepares for "the biggest year of his career so far".
In 2021, KSI has scored a number one album with All Over The Place and launched a European tour, and is due to perform at The SSE Arena in Wembley in February 2022.
Filming on the documentary, produced by Mindhouse, is already under way.
Bafta-winning documentary-maker Theroux said: "It is a huge thrill to be working with JJ on this definitive documentary.
"He is a huge talent, a totally self-created phenomenon who has gone from bedroom-bound nerd with a handful of subscribers to an online colossus with fans in the millions, purely through the power of his work ethic and his will to win.
"The documentary will be an opportunity to see another side of JJ, understanding how he got where he is, the world of a premium online content creator today, and a man who has made it his brand never to lose, as he takes on the music business."
Watford-born KSI said: "I'm super excited for people to finally see what I mean by 'hard work’.
"People will get to see the behind the scenes of the key events in my life and show them how I do everything I do."
