In Norse mythology
, the sea serpent Jormungand
was a child of Loki
. The Aesir
knew Jormungand would be dangerous for humanity, so they tossed him into the waters that encircled Midgard. Jormungand grew so big that he was able to surround the earth and grasp his own tail.(see Ouroboros
During Ragnarok, Thor will finally kill Jormungand, but not before Jormungand can drop poison on Thor and kill him as well.
Jormungand is also sometimes referred to as the Midgard Serpent.