His current record stands at 16 wins out of 16; one of only two unbeaten champions in the show's history - the other one being Nic Brown.
Graham made his debut on Countdown on 20 July 2000 and won the maximum eight consecutive heat games making him the number one seed.
Graham returned three years later for the C of C. He was one of several unbeaten players, including Ben Wilson, Chris Wills and Julian Fell.
Graham held a one-point lead going into the final round, and it was he who spotted the crucial conundrum to win the match 120 - 109.
This tied the highest scoring match in history (229 total points) Graham's semi-final was another excellent game.
Indeed, Graham went on to win by 21 points, setting up a final with Series 47 unbeaten champion Chris Wills.
The final was a low-scoring affair, not helped by poor letters selections and difficult numbers games.
The show was hosted by Countdown's own Carol Vorderman and former Football Italia presenter James Richardson.