PACKET ONE: “Once Upon a Time”

In the movie Conan the Barbarian, this is the entity worshipped by Thulsa Doom. In the Marvel universe, this entity took control of the dinosaurs and used them to try to kill mammals. In ancient Egypt, Apocalypse was mistaken to be this entity. FTP, identify this deity, whose name has been used for various Marvel entities that do not always ... ................
................