‘Tyson’: A Charismatic Ex-Champ

A documentary, like any movie trying to hold your attention, needs either a big theme — some tremendous political injustice will do — or a magnetic character that keeps people watching. Tyson has character to spare, since its subject and star is the two-time heavyweight champion and three-year guest of the Indiana penal system. In boxing, “the sweet science,” he was the Frankenstein monster