Stark guard (The Old Gods and the New)

Jacks is a minor character in the second season. He is played by guest star Paul Caddell and only appears in "The Old Gods and the New." Jacks is a House Stark guardsman fighting for King Robb Stark in the War of the Five Kings.

Season 2
Jacks is a House Stark guardsman fighting for King Robb Stark in the War of the Five Kings. He is congratulated by Robb for plundering a Lannister helm.

In the books
In the Song of Ice and Fire novels, Jacks is a similar minor character. He is one of the guard that accompanies Eddard Stark to King's Landing. He is one of the few survivors of the massacre that coincides with Eddard's arrest. He is later released to accompany Eddard's remains north.