The 38-year-old Johnson spent 17 seasons in the NBA with the Boston Celtics, Phoenix Suns, Atlanta Hawks, Brooklyn Nets, Miami Heat, Utah Jazz and Houston Rockets.
He was named an All-Star seven times in his NBA career, with six of those nods coming as a member of the Hawks.
During his seven seasons in Atlanta from 2005-06 through 2011-12, Johnson was one of the NBA's best offensive players with averages of 20.9 points and 5.2 assists per game.
For his NBA career, Johnson owns averages of 16.0 points, 4.0 rebounds, 3.9 assists and 1.6 three-pointers made per game.
While Johnson's NBA comeback attempt didn't work out, his return to BIG3 is a major coup for the up-and-coming league.