Meet Jörmungandr, Loki's offspring and the ultimate prankster serpent! Not only does he kickstart Ragnarök, but he also manages to outwit Thor, the thunderous god!

Whether you're a fan of Thor's hammer-wielding exploits or fascinated by Loki's trickster antics, the world of Norse mythology offers a treasure trove of stories that have stood the test of time.

Neil Gaiman stops by the WSJ Cafe to discuss his new book "Norse Mythology" and how his take on Thor, Odin and Loki is different from Marvel's comic book version. Photo: Getty Images Fort Knox Has ...