Robert Eagle scored his first two goals for Grimsby as they twice fought back from two goals down at Forest Green.
Rovers' Reece Styche lobbed in the opener from the edge of the area before James Norwood's neat right-foot finish.
Grimsby pulled a goal back two minutes later when Eagle headed home a Michael Cummins cross from 12 yards out.
Yan Klukowski put Rovers two goals ahead again before Andrew Wright scored from outside the area and Eagle latched on to Peter Bore's cross to equalise.
Forest Green: Bittner, Hodgkiss (Herring 67), Luke Jones, Caines, McDonald, Norwood, Mike Fowler, Lee Fowler, Flood (Klukowski 46), Styche, Watson (Else 83). Subs Not Used: Zak Jones, Grimes.
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