According to the Prose Edda, Jörmungandr was tossed into the great ocean that encircles Midgard. Instead of drowning, he simply grew so large that he was able to surround the earth and grasp his own tail, like an ouroboros. As a result, he received the name of the Midgard Serpent (Midgardsormr) or World Serpent. It is believed that when he lets go of his own tail, the world will end. Jörmungandr's arch-enemy is the god Thor.
The last meeting between the serpent and Thor is predicted to occur at Ragnarök, when Jörmungandr will come out of the ocean, and flood the world or poison the sky. Thor will kill Jörmungandr but will die himself because of the serpent's venom.
As Ragnar and his men prepare for to leave for their first journey west, Lagertha is at home with Björn and Gyda. She tells them the story of Thor and his battle with Jörmungandr. The Seer tells the story of Ragnarok, and Jörmungandr's role in the ultimate battle, to Athelstan.
|Season six appearances|
|New Beginnings||The Prophet||Ghosts, Gods, and Running Dogs||All The Prisoners||The Key|
|Death and the Serpent||The Ice Maiden||Valhalla Can Wait||Resurrection||The Best Laid Plans|
|King of Kings||All Change||The Signal||Lost Souls||All At Sea|
|The Final Straw||The Raft of the Medusa||It's Only Magic||The Lord Giveth||The Last Act|