Showtime Sports chronicals the sprawling journey of number one NBA draft pick Ben Simmons. From a relatively anonymous Australian upbringing to high school and college in America to the top of the top of the rookie class in the world's foremost basketball league, ONE & DONE captures the pivotal period in a young man's life, capturing Simmons and his inner circle as they realize a lifelong dream in the limelight of an exclusive fraternity of top NBA draft picks.