Jörmungandr, also known as the Midgard/World Serpent, is one of the three children of the god Loki and the giantess Angrboða. It got its title "World Serpent" when Odin threw the serpent into the ocean that surrounds Midgard, the physical world, and it became so large that it could wrap itself around all of Midgard. However, it has been foretold that Thor and Jörmungandr were destined to slay each other in the battle of Ragnarök, the end of the world.