The Deep Sea, 1950's
An Unnamed Prehistoric-looking Ocean Creature was swimming around minding its own business until it spotted a nuclear waste. Given its POV that it looks like dead whale flesh, It feasted upon the waste while it rapidly adapted to the waste and kept consuming the waste until it was time to go to the surface
Years Later
The Creature has now taken into a full form where all of its colors are black and red, the arms are developed but not long enough to be longer than its body, very small sunken eyes, a very long tail with possible extra head on the tail tip and crooked teeth. The Former Aquatic Creature now has turned into a Reincarnation of a god or worse: The inevitable Doom and was been in Tokyo ever since, not even caring about its surroundings and is probably not aware of humanity..yet
While it isn't aware of its surroundings, It unintentionally crushes people and cars and goes through buildings, and some of them are destroyed because of it. The government will not accept that and sends out its tanks and Stealth Bombers where this will be the last thing they do before they awaken the inevitable doom's fury