Fourteen-year-old, hoops-loving Calvin Cambridge has a dream: to be a famous basketball player--to mix it up among the NBA's greatest. But in a game dominated by giants with unparalleled athletic abilities, Calvin's age, diminutive stature and limited skills, make this dream a far-off fantasy... Or is it? After he laces up a mysterious pair of old sneakers, inscribed with faded initials M J, Calvin makes the leap from playground hijinks to NBA superstardom... hitting 25-foot jumpers, making behind-the-back passes and slamming home devastating dunks. Along the way, Calvin teaches his incredulous All-Star roommate and teammates a few non-hoops-related lessons.