After trailing to Danny Rose’s 16th minute goal for the Mariners, Dons scored twice in quick succession through Alex Gilbey and Scott Hogan to take the lead before Connor Lemonheigh-Evans scored in stoppage time to make sure of the result.
The trio of victories lift Dons into ninth in League Two, just one point outside the play-off spots.
Here’s how we rated the players.
1. Tom McGill -7.5
Critically kept his side in the game at 1-0 just after the break with a huge one-on-one save just before Dons' double saw them take the lead | Jane Russell
2. Laurence Maguire - 6.5
Like the rest of the team really, struggled with Grimsby's quick opening to the game, but settled in the second and kept the dangerous Obikwu very quiet | Jane Russell
3. Luke Offord - 6.5
Back in the centre of the defence once again, grew into the game after a patchy opening half an hour | Jane Russell
4. Sam Sherring - 6.5
A solid return to the side after a while out. Had a couple of run-ins with Obikwu which saw him come out second best but recovered well and held firm in the second-half | Jane Russell