Dominick Dresden is a major character in the fifth and sixth seasons. He was previously a recurring character in the second, third, and fourth seasons. He is Carmine Grayburn's long-time best friend, the older brother of Taria Dresden, and the firstborn of Ser Thoras Dresden, the Master-at-Arms of Deepwood Motte. When Carmine forms Grayburn's Legion, Dominick becomes his second-in-command, and when Carmine is killed during the Siege of the Dreadfort, Dominick takes over as its new High Commander.
Dominick arrives leading Grayburn's Legion to Winterfell alongside Petyr Baelish's reinforcements from the Vale. During the battle, Dominick personally goes after Rodrik Nyte and, despite Rodrik initially having the upper hand, Dominick is able to fight back and viciously attacks him as recompense for the threats Rodrik made against his sister Taria.