In Norse mythology, Jörmungandr, also known as the Midgard Serpent, or "World Serpent", is a sea serpent, and the middle child of the giantess, Angrboða and the god, Loki. According to the myths, Odin took Loki's three children by Angrboða—Fenrir the Wolf, Hel, and Jörmungandr—and cast them out to separate worlds. Odin tossed Jörmungandr into the great ocean that encircles Midgard. The serpent grew so large that it was able to surround the earth and grasp its own tail. As a result, it received the name of the Midgard Serpent or World Serpent. Jörmungandr's arch-enemy is the thunder-god, Thor. The ancient Norse believed that if it releases it's tail, Ragnarök would begin, and the Midgard Serpent would kill and be killed by Thor.
In the series
- Jörmungandr has never appeared in the series, but mentioned in later episodes of the third and final season. There was talk that it was stirring, causing trouble, and rumors about it letting go of it's tail. All that was happening because Odin (as Axl Johnson) caused global warming.
- When Odin and Frigg were reunited, they emerged from their mortal vessels, along with all the other gods and goddesses who were and weren't present at The Ga, and they all returned home to Asgard. When they returned home, and their powers restored in-full, and the first thing Odin did was he brought Michele Brock back to life from death, and then he prepared for battle against the Midgard Serpent, and save the world from Ragnarök. Presumably, Odin (aided by Thor, possibly) won the fight against Jörmungandr, and restored balance to the world in the end.