The new 2D animated series will consist of 26 half-hour episodes spread across two seasons, or Books 1 & 2 in “Avatar” style. News of the pickup comes as “Last Airbender” prepares to celebrate its 20th anniversary, with the original show having debuted on Feb. 21, 2005.

Get the first official details on the next Avatar. The next generation's Avatar has awakened, and she's an earthbender.For the 20th anniversary of Nickelodeon's Avatar: The Last Airbender, the network revealed the first official details on the next animated sequel series,

Rumours about the next mainline Avatar series have been circulating ever since Nickelodeon announced that Michael DiMartino and Bryan Konietzko were returning to lead Avatar Studios. But now, we finally know a bit more about where the franchise is heading after The Legend of Korra.