ESPN revisits boxing's blockbuster bouts in this knockout documentary that features Muhammad Ali vs. Joe Frazier in the Thrilla in Manila, Sugar Ray Robinson vs. Jake LaMotta in the St. Valentine's Day Massacre and more full-length matches. Other bouts include Joe Louis vs. Max Schmeling, Evander Holyfield vs. Riddick Bowe, Jack Dempsey vs. Gene Tunney and more. Revealing interviews provide fascinating insight into these legendary competitors.