"Deep Breath", the first episode of Series 8, is abbreviated 8x01. It is the 801st episode of Doctor Who counting forward from ”An Unearthly Child in 1963. Therefore, it is simultaneously episode 8x01 and 801. The same goes for the rest of Series 8.
My definition of fun is different than other people’s, I think.
The writers of ATLA and Nickelodeon released comic book sets that explain what happened to Zuko’s mother, Toph’s relationship with her parents, how Republic City was founded, and other events that are linked to the Legend of Korra.