 In the 2004 Grey Cup Championship against the BC Lions, Allen was named Grey Cup Most Valuable Player for third time in his legendary career.Allen led the Argos to their fifteenth Grey Cup Championship and won his fourth championship.Allen finished the game with 23 of 34 pass completions for 299 yards (longest gain, 34 yards) and 1 touchdown pass, and rushed 5 times for 10 yards (longest gain, 5 yards) and 2 rushing touchdowns.