Canadian phenomenon Sidney Crosby skated into the limelight from the very start of his hockey career. In only his second season playing in the NHL, "Sid the Kid" became the youngest player ever to get over 100 points in a season. As captain of the Pittsburgh Penguins, Sidney led his team to a Stanley Cup victory in 2008. But in the 2011 season, he suffered a concussion, a head injury that still has consequences for him today.