Do you remember the dragon, the snake (or, serpent) of old, is the devil/satan?this verse ties them all together
Revelation 17:8King James Version (KJV)
8 The beast that thou sawest was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth shall wonder, whose names were not written in the book of life from the foundation of the world, when they behold the beast that was, and is not, and yet is.