Avatar: The Legend of Korra, Book Two: Spirits, "Chapter One: Rebel Spirit" and "Chapter Two: The Southern Lights" (2013)
I'll try and keep the context brief, because... there's a lot. The Legend of Korra is an animated series that's a sequel to Avatar: The Last Airbender, which is... it's great. Like, astonishingly great. If you've never seen The Last Airbender, go watch it now (just don't bother with the abysmal live-action movie). It's a fantasy inspired heavily by martial arts movies and the films of Miyazaki. The series is funny, dramatic, and beautiful. Korra is set decades after The Last Airbender, when the main characters of that show are either old or, in some cases, dead (Korra herself is the reincarnation of the titular character of the preceding show). Technology has evolved, allowing the showrunners to remake the world with a steampunk aesthetic. As a whole, The Legend of Korra doesn't live up to its predecessor. To be fair, virtually nothing compares with The Last Airbender, so that's less an indictment of Korra than an acknowledgment of how good Airbender...