AWOL: The Standard Babylonian Epic of Gilgamesh.
The Epic of Gilgamesh is surprisingly relevant for the study of the Bible, ancient Judaism, and even late antique Christianity. Gilgamesh resurfaces as a giant in the Book of Giants and the Epic has connections with the Flood Story etc. And Gilgamesh remains influential in popular culture even today. On all this, see the past posts here, here, here, here, here, and here.