A Greek myth is that Zeus, a God, threw down lightning bolts on to earth when he was in a rage. While Norse myth reckons that Thor, another God, would cause lightning with his massive hammer.

Ares, the Greek God of War, loves to witness the atrocities ... and has caused much death and destruction, including tricking Thor into killing friends. Knull, the Eldritch God of Darkness ...

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 ...