Avatar Korra fights to keep Republic City safe from the evil forces of both the physical and spiritual worlds.

Thorfinn pursues a journey with his father's killer in order to take revenge and end his life in a duel as an honorable warrior and pay his father a homage.

A thousand years after the destruction of Earth by gigantic aliens called Gauna, mankind is living on massive spaceships. One of these space ships is Sidonia, which is protected by large pilot controlled exosuits called Gardes.