 North was a product of the Grimsby Town youth team and made the step up to the first team at the start of the 2004–05 season under Russell Slade.North made his professional debut for The Mariners in a 3–0 away defeat against Bristol Rovers in on 5 February 2005, when he came on in the 89th minute for Andy Parkinson.North, only made one appearance for The Mariners in the following season, against Mansfield Town.