Glinn Corak was an aide to Gul Lemec. He accompanied Lemec to the USS Enterprise-D in an attempted to defuse tensions between the Federation and Cardassia. Actually, the Cardassians were planning a surprise attack on Minos Korva. Their plot was foiled by Captain Edward Jellico who was able to plant mines on the hulls of the Cardassian ships. (TNG: "Chain of Command, Part I", "Chain of Command, Part II")