The season premiere starts out 3 years after Season 3's end. The Earth kingdom has fallen into anarchy due to the fall out of Season 3's finale. This episode sets up Earth General Kuvira's (aka Great Uniter) mission to reunite the Earth Kingdom.
Did You Know?
This season is set 3 years after the showdown with Korra and Zaheer. See more
When Korra gets here, I bet she won't even know who I am!
Because Meelo the boy, has turned into Meelo the MAN!
Right... you're completely unrecognizable.