APEP: Evil Snake Demon of Darkness and Confusion. He is the great serpent monster who swallows light for a light snack.

He lives in the darkness of the Underworld and lies in wait for RA the Sun God to appear each evening. Gulp. But RA's team of snake slayers are on hand to repel the attack and so the sun is able to rise again in the morning.

Occasionally APEP manages to take a bite and we get an eclipse. The ancient Egyptians always got very nervous on cloudy days...