Thornton continued to build into a key player in the Bruins' line-up, increasing his points total in each of the following two campaigns. Prior to the 2002–03 season, he was named team captain, succeeding Jason Allison, who was traded to the Los Angeles Kings in 2001; the captaincy position was vacant for a full season after Allison's departure. In his first season as team captain, Thornton recorded 68 points over 66 games. The following year, he notched his first career 100-point season with 36 goals, a career-high, and 65 assists. He ranked third in NHL point-scoring, behind Peter Forsberg of the Colorado Avalanche and Markus Näslund from the Vancouver Canucks.