
In an interview for Entertainment Weekly, production designer Scott Chambliss stated: "Ghidorah is from another planet".
I'm not sure if anything has been officially released about Ghidorah's origins in the Monsterverse, and he very well could have been just referencing the classic view of the character, but to me, it sounds like he's referencing the Ghidorah in the new movie, so i thought I'd share it with y'all.
Edit: Wow, I forgot to link the article. Here it is:
https://ew.com/movies/2019/05/26/godzilla-king-of-the-monsters-king-ghidorah-2/

Nice new forum signature, Goji!
If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Thanks man! Chris said i could not have a gif in my signature, so I changed it.... again
Zwei Wing is the best singing duo. Change my mind.

Oh, that sucks. But I think this looks even better! And it doesn't give me a headache to look at XD
If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Well if it is an alien, that opens up interesting possibilities does it not? Maybe the aliens will show up in a future entry bringing MechaGodzilla with them.

Bring on alien invasions. Go bonkers.

I found the source, guys! There's also tons of other cool tidbits about Ghidorah's design!
https://ew.com/movies/2019/05/26/godzilla-king-of-the-monsters-king-ghidorah-2/