The former Liverpool youngster has impressed since joining the Lancashire outfit in the summer, scoring three goals in seven games to help them to third place in League Two.
Mullin's initially one signed a one-year deal with the club, but has now committed himself to them until 2017.
The 19-year-old joined Morecambe after a successful trial period in pre-season, having been released by Huddersfield Town.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| C | Stockport CountyStockport | 46 | 27 | 11 | 8 | 96 | 48 | 48 | 92 |
| P | Wrexham | 46 | 26 | 10 | 10 | 89 | 52 | 37 | 88 |
| P | Mansfield TownMansfield | 46 | 24 | 14 | 8 | 90 | 47 | 43 | 86 |
| 4 | MK Dons | 46 | 23 | 9 | 14 | 83 | 68 | 15 | 78 |
| 5 | Doncaster RoversDoncaster | 46 | 21 | 8 | 17 | 73 | 68 | 5 | 71 |
| 6 | Crewe AlexandraCrewe | 46 | 19 | 14 | 13 | 69 | 65 | 4 | 71 |
| 7 | Crawley TownCrawley | 46 | 21 | 7 | 18 | 73 | 67 | 6 | 70 |
| 8 | BarrowBarrow | 46 | 18 | 15 | 13 | 62 | 56 | 6 | 69 |
| 9 | Bradford CityBradford | 46 | 19 | 12 | 15 | 61 | 59 | 2 | 69 |
| 10 | AFC Wimbledon | 46 | 17 | 14 | 15 | 64 | 51 | 13 | 65 |
| 11 | Walsall | 46 | 18 | 11 | 17 | 69 | 73 | -4 | 65 |
| 12 | Gillingham | 46 | 18 | 10 | 18 | 46 | 57 | -11 | 64 |
| 13 | Harrogate TownHarrogate | 46 | 17 | 12 | 17 | 60 | 69 | -9 | 63 |
| 14 | Notts County | 46 | 18 | 7 | 21 | 89 | 86 | 3 | 61 |
| 15 | Morecambe | 46 | 17 | 10 | 19 | 67 | 81 | -14 | 58 |
| 16 | Tranmere RoversTranmere | 46 | 17 | 6 | 23 | 67 | 70 | -3 | 57 |
| 17 | Accrington StanleyAccrington | 46 | 16 | 9 | 21 | 63 | 71 | -8 | 57 |
| 18 | Newport CountyNewport | 46 | 16 | 7 | 23 | 62 | 76 | -14 | 55 |
| 19 | Swindon TownSwindon | 46 | 14 | 12 | 20 | 77 | 83 | -6 | 54 |
| 20 | Salford City | 46 | 13 | 12 | 21 | 66 | 82 | -16 | 51 |
| 21 | Grimsby Town | 46 | 11 | 16 | 19 | 57 | 74 | -17 | 49 |
| 22 | Colchester UnitedColchester | 46 | 11 | 12 | 23 | 59 | 80 | -21 | 45 |
| R | Sutton UnitedSutton | 46 | 9 | 15 | 22 | 59 | 84 | -25 | 42 |
| R | Forest Green RoversForest Green | 46 | 11 | 9 | 26 | 44 | 78 | -34 | 42 |
| > League Two Full Table | |||||||||
