When Thor, the Norse god of thunder, and prince of Asgard noticed that the winter was lasting much longer than usual, he became concerned.
There was an ancient prophecy in Asgard, that predicted the end of time, and it would all start with Fimbulvertr, a long three-year winter, and the current winter already lasted a full year.
So yes, he was worried
But not for him, but for his son and his pride
Naruto
He would be damned if he let his son go through the hell he knew would come.
It was time for him to plan something


it was all chaos.

His father, Odin the All-Father had been killed by Fenrir. The great serpent, Jörmundgander, had awakened and was causing tidal waves and spewing poison all over the world, and Thor knew it was his duty to defeat it and die in the process.
But there was one last thing he had to do, he had to save his son.
His son Naruto, now the god of thunder (Thor had passed his title to him after assuming the title of King of Asgard after the death of his father Odin), he was his pride and joy, even though he was young, he was 1600 years old (although he appears to be 16), he was young compared to the other gods. He already showed great talent and would be a great addition to Asgard's army.
Unfortunately, there was no time.
Ever since he realized Fimbulvertr, and with him Ragnarok, Thor had prepared a way out, a way to protect his son and his heir.
A single-lane Bifrost, with capacity for a single person.
To somewhere beyond the nine realms.
A place they had never been and that Ragnarok would never reach.
And more importantly, a place where your child could live.