The Leviathan (Omniverse)

The Leviathan is one of God's primordial creations in the series: Power Rangers: Omniverse.

History
The Leviathan is an ancient monster that served as God's "First Beast" and weapon in his war against another being in primordial times. Thus, they predate Archangels, normal angels, humans, and the soul itself. The creature was proved to be too hungry and destructive, so God created Purgatory and locked them away. They were inadvertently released when Castiel opened the door of Purgatory and absorbed all the souls inside in order to defeat the Archangel Raphael.