The McChicken* came before the McEgg**
Here, the McChicken is the Story and the McEgg is the Map.
* The alien entity that is McChicken was banished aeons ago by an ancient, elder race of unknown and unimaginably powerful beings. Entombed in a small meteorite, the octopoid deviant known as McChicken was sent hurtling through the frozen depths of space, covering untold light-years, until his prison-tomb smashed into the primal Earth and was buried beneath the crust.
Millions of years past, and McChicken was trapped, incarcerated beneath rock and ocean. Dreaming evil dreams, he laid waiting throughout the ages until weak-willed and power-hungry creatures called humans, in their folly and blind curiosity, came to know the dreams of McChicken and became enthralled by his promises of power. A plot was set in motion to release the alien being and today we approach the day of reckoning, when McChicken will rise from His slumber and break free onto the surface world. And he will bring with him one huge appetite…
** The original McEgg, laid 100 million years hence, had a diameter of two miles. This gives you an idea of just how big McChicken is.