The massive Agnar held the title of King of the Eagles on his native plane of Asgard. At some point he became the prisoner of the Storm Giants. The Golden Apples of Idunn: Thor and Loki once escaped on his back when they were on the run from those Giants after having retrieved the Golden Apples of Idunn. According to another account, Agnar, an half-breed Air Colossus and the Half-King of Eagles, sent the Aerie Legion to capture Idunn while she was harvesting the golden Apples. Thanks to Thor and Loki, Agnar was defeated and seemingly killed.