Swindon stayed level on points with Grimsby in the League Two table after the two sides played out a 1-1 draw at the Energy Check County Ground.
Theo Robinson scored his second in two games at SN1 after Ludvig Ohman was sent off for the visitors in the second half.
However, just a minute later Grimsby were level through Luke Hendrie and despite Town dominating proceedings they had to settle for a point.
Kyle Bennett made his full debut, coming in for the injured Michael Doughty. Luke McCormick made his first start since Swindon played Woking with Lawrence Vigouroux missing out with a shoulder injury.
Academy graduate, Jacob Bancroft made the bench for the first time.