In 2004, Dickenson began the season as the Lions' starting quarterback, but gave way to backup Casey Printers after suffering a knee injury. Printers put on a dominating performance for the rest of the season, but in the West Division Final against the Saskatchewan Roughriders, was forced to leave the game with a shoulder injury in the fourth quarter, with the score tied 14-14. Dickenson, having recovered from knee surgery and shared quarterbacking duties with Printers late in the season, played the rest of the game and threw a touchdown pass in the Lions' 27-24 overtime victory. Dickenson would start and play the entire Grey Cup game against the Toronto Argonauts, which the Lions lost by a score of 27-19.