Paul came through the ranks at Liverpool before joining then La Liga side Santander on a short term deal.
On his return to England Paul signed for Huddersfield Town on a 1 year deal for the 2012-13 season.
In the summer of 2013 Paul signed a 1 year extension to keep him at Huddersfield until the end of the 2013-14 season.
After his contract with Huddersfield expired Paul joined the Shrimps on trial for the 2014 pre-season where he scored 5 goals in 4 games after which he signed with the club for the 2014-15 season.
A successful start to his career with the Shrimps, Mullin was rewarded with a 2 year extension to his contract which sees the then 19 year old stay at the Globe until Summer 2017.
During the 2014-15 season, the front man scored 8 goals in 20 appearances for the Shrimps.
Video: Paul Mullin's 8 goals in his debut season for Morecambe