Netflix has released the first full official trailer for its live-action adaptation of “Avatar: The Last Airbender. What it shows: The new trailer teems with Fire Nation warfare and teases additional characters such as King Bumi (Utkarsh Ambudkar), Jet (Sebastian Amoruso), June (Arden Cho) and her mount Nyla, a creature known as a shirshu. Forest spirit Hei Bai also appears in its non-panda form, while Aang (Gordon Cormier) enters the powerful Avatar State.