Jarg was in charge of a group of bandits who kidnapped Alvin the Treacherous and held him for ransom. He was instructed by his bosses not to acquire gold, but Ice Tail Pike.
The Outcasts brought in the help of Thor Bonecrusher. Surprisingly Thor Bonecrusher double-crossed the Outcasts and alerted Jarg of a set-up. However, Thor Bonecrusher tackled power away from Jarg and started running the kidnapping operation. Eventually, however, Bonecrusher double-crossed the bandits, Alvin was saved, and their fish bounty lost.
Jarg returned to his bosses, Krogan and Viggo Grimborn, with the news of his failure. For his failure, Viggo suggests tossing him down a Whispering Death hole, but Krogan indicates that that wasn't a good idea. Instead, Krogan wants to witness Jarg suffering as he dies. He then has Jarg dragged off by a soldier, and he's heard screaming, which suggests he's being killed by getting tortured slowly.
Jarg is a bald, clean-shaven adult man with a bulbous nose. He is thick and stout. He has probably seen many fights in his lifetime, as he is missing his right eye and wears a wide black patch over it.
Abilities and Skills
Fighting: Jarg is a skilled combatant, for he is able to disarm and overpower both Fishlegs and Snotlout. He is then defeated when Fishlegs tackles him out of rage for knocking Snotlout out.