Standing at six-foot-four, the Lanark-born centre-back is an extremely powerful weapon for the Dons and is contracted to stay at stadiummk until June 2013.
After starting his career with Old Firm giants Rangers, Gary was taken to Dundee by then-Dons first team coach Alex Rae in 2006. The Lanark-born defender went on to make 110 appearances for the Dark Blues.
Injuries and suspensions prevented Gary from featuring as much as he would have liked, yet he still managed to rack up 32 appearances for the Dons last season and was called up to Scotland for a friendly, although failed to feature.
The Scotsman suffered another injury at the beginning of the 2012/13 season and subsequently joined Championship side Blackpool on loan for the remainder of the campaign in February.