As "The Legend of Korra" Book 3 gears up for its return, rumors regarding the plot, the villain, and even the dragon in the new teaser trailer have surfaced.

First, a recent teaser trailer from the Netherlands of "The Legend of Korra" Book 3 has showcased the fact that dragons may have surfaced into the Korra era after "Avatar: The Last Airbender."

Many are coming up with theories and rumors about how a dragon (or dragons) could have survived.

"I think the red dragon is from the golden egg that Aang and Zuko found in 'The Firebending Masters.' Remember how Aang said it felt alive? That would be a reasonable explanation for how the dragons managed to survive," posits AvatarAang926.

How do you think there are dragons in "The Legend of Korra" Book 3?

It has also been confirmed that "The Legend of Korra" Book 3 will travel to the Earth Kingdom and Fire Nation. Not only that, it is highly likely that the Earth Queen will be introduced in "Change."

"There are women world leaders in the Avatar world during Korra's present: Zuko's daughter is the Fire Lord, and there is an Earth Queen ruling the Earth Kingdom," writes Konietzko on his Tumblr.

Many rumors are out there regarding the identity of the Earth Queen, and the popular theory is that voice actress Alyson Stoner will be playing role.

She has confirmed that her role will be named Opal, and since the character was not seen in Book 2, Book 3 seems likely.

And much like Book 1 and 2, many are curious what the big bad villain of Book 3 will be after the madness of Dark Vaatu.

Many believe that the reason Lin Bei Fong (and "The Legend of Korra") refuses to talk about her father is that he has done something very bad. Having Lin's father as an antagonist would be cool, although the theme of familial conflict has been thoroughly explored in Book 2.

The other theory is that voice actress Grey Delyle (who voiced Azula in "Avatar") will be playing the villain of Book 3, based on an interview from last year.

"All I can say, for sure, is that I'm not Azula again. I wish I could say what kind of bender she was... I'll just say she's not a firebender. And I haven't actually seen her art yet, but, she's a... she's a bad girl."