What is Shin-Gojiras actual origin?

SPOILERS!  SPOILERS!  SPOILERS!

Baring any explanation I missed since I do not understand a great deal of Japanese yet, here is what I know about Godzilla's origins from seeing the film twice:

In 1954 (or at least around that time), a bizarre life form was discovered feeding on nuclear waste dumped into the sea.   Japanese scientist, Goro Maki, names it Gojira after a mythical monster god revered and feared on his home island of Odo.  He ultimately teams up with the American government, who are highly interested in studying the beast, which they code name "Godzilla".  Time passes, and through a mysterious and still unknown sequence of events (maybe we will learn more from the sequel?), Goro Maki commits suicide circa 2016, leaving his few belongings and data on Godzilla on his boat, which he leaves floating empty in Tokyo Bay.  Soon after the boat is discovered, an eruption of a mysterious red liquid rocks the bay, and soon after a tail emerges from the water.  Like a slow moving tsunami, the initial form of Godzilla makes way inland, ultimately evolving into a second form before escaping back into the sea, evolving again, and returning to destroy Tokyo in his final form.

The exact origins of the beast, and what happened between his initial discovery and his emergence in Japan in 2016, are (as far as I can tell) left a mystery in the movie.  It is known that the monster's cells can reproduce asexually, like Sanda and Gaira's cells from War of the Gargantuas, and that, at the end of the film, smaller monsters seem to be emerging from his tail.

We may have to wait for a sequel to get more answers. :)

I have heard a number of theories on just what Godzilla is, and many of them are pretty wild!  Supposedly, there is an initial, tadpole-like form of the monster not seen in the film, and it is this form that ultimately develops into Godzilla's more recognizable, final form.  Some people think he could be a small animal that underwent mutation, perhaps ancient and undiscovered.  Perhaps a single cell underwent a mutation that caused it to evolve abnormally.  Due to the high interest on the part of the American government in studying the monster for over half a century, some have speculated that Godzilla was accidently created by American scientists, monitored to make sure it never got out of hand.  Another theory is that the Americans wished to exploit this creature as a potential weapon one day, or perhaps that Godzilla was a man-made bio-weapon, which might explain his invulnerability and built-in radar, which enables him to sense and destroy stealth B2 bombers during the film.  The craziest theory I've heard is that Godzilla is a human mutation, perhaps even a mutation of Goro Maki himself.

These are only a few of the theories I've heard, and who knows which one is true, if any!  Honestly, the most important thing is that Godzilla, no matter his origin, appears in this film as an unstoppable god, a divine destroyer of unlimited destructive power armed with near invulnerability.  And he's scary.  Very, very scary.

He is, you might say, our greatest, worst nightmare. ;)

@Danzilla93

Thanks for that detailed explanation!!!

^Way to contribute nothing to an already dead thread.

A dumpster