Four years ago, Ben Simmons was a teenager living in Australia. On Thursday he'll likely be the No. 1 pick in the NBA Draft.

It's been a whirlwind journey for the 19-year-old phenom, and a Showtime Sports documentary will give us an up-close and personal view of what it was like.

One & Done has been in production for two years with exclusive access, and will focus largely on Simmons' year of college at LSU, where he was a consensus first-team All-American.

The camera crews will also follow Simmons and his fellow NBA prospects around Brooklyn as they prepare for the biggest night of their careers.

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Ben Simmons will likely be the No. 1 pick in the NBA draft. USATSI
"One & Done chronicles a unique and pivotal period in a young man's life," said Showtime Sports Executive Vice President and General Manager Stephen Espinoza. "Over the last year, as Ben Simmons has transitioned from teenager to young adult, he has also transitioned from the relative anonymity of a supremely talented high school player to the national and international limelight of the exclusive fraternity of top NBA draft picks. Ben Simmons is navigating a path that, although dreamt of and aspired to for a lifetime, remains uncertain."

The documentary, which will premiere in October, will also explore the "one and done" rule itself, examining both sides of the argument.

"It's been an honor to have the opportunity to follow Ben for the past two years," said executive producer Maura Mandt. "The openness of Ben and his family during this remarkable transition in his life is truly unprecedented. Anyone can relate to a young person who has spent their life working toward a dream that is within their sights, while at the same time, not knowing what obstacles may lay ahead."