An equaliser from Tom Craddock deep into injury-time saw Luton grab a draw at Grimsby.
Peter Bore got Grimsby off to a lightning start when he hit home a loose ball after just 40 seconds.
But Craddock equalised from the spot with a cool penalty after he was brought down by keeper Phil Barnes.
Ryan Bennett nodded in Peter Till's cross to put Grimsby back in front but Craddock had the last word, firing a shot into the bottom corner of the net.
Grimsby: Barnes, Clarke, Bennett, Heywood, Newey, Till, Hunt, Trotter, Hegarty (Llewellyn 85), Jarman (North 76), Bore.
Subs Not Used: Montgomery, Taylor, Stockdale.
Booked: Barnes, Jarman.
Goals: Bore 1, Bennett 58.
Luton: Logan, Gnakpa, Spillane, Roper, Davis (McVeigh 68), Jarvis, Keane, Hall (Patrick 82), Howells, Martin (Parkin 68), Craddock.
Subs Not Used: Brill, Worley.
Booked: Spillane, Jarvis, Parkin.
Goals: Craddock 24 pen, 90.
Ref: Andy Haines (Tyne & Wear).