She was portrayed by Tina Turner.
Aunty Entity was a ruthless ruler of a post-apocalyptic town known as Bartertown. She was an Amazon-like woman who ruled with an iron-fist but found herself being challenged by the diminuative Master and his brutish henchman Blaster: Aunty Entity is enraged at this but is unable to publically oppose the duo of "Master Blaster" due to Master being the only one who knows how to work all the machines that keep Bartertown running.
To this end the scheming Aunty Entity manipulates "Mad" Max into a gladiatorial battle (known as the "Thunderdome") against Blaster with hopes Max will kill him, in effect using Max as a convenient means of exacting political assassination without being caught.
Max manages to defeat "Master Blaster" in combat but refuses to kill him when he realizes after knocking his helmet off, that he suffers from mental retardation- Aunty Entity is enraged and has Blaster executed before invoking the harsh law of "bust a deal, face the wheel" upon Max.
This ritual puts punishment at the hands of chance - much like a wheel-of-fortune as it is equipped with an arrow that will eventually stop at a number of punishments: Death, Hard Labour, Acquittal, Gulag, Aunty's Choice, Spin Again, Forfeit Goods, Underworld, Amputation, and Life Imprisonment.
Max ends up landing on Gulag and is exiled from Bartertown via being strapped to the back of a horse which is whipped and goaded into running further via chasing a bottle of water tied to its head.
However Max survives his ordeal and soon finds a group of children living in the wilderness - who aid his recovery but wish to find "Tommorrow-morrow-land": a mythical paradise they believe lies in civilisation, Max tells them that they are better off staying away from civilisation (Bartertown) but some of the children refuse to listen and head off regardless - Max has little choice but to pursue them.
Max catches the children in the outskirts of Bartertown and together they go in search of Master, the dwarfish Master has been reduced to little more than a slave by Aunty Entity due to the death of his protector, Blaster - Max and the children free him, but alert the guards in the process and a frantic chase ensues, resulting in Bartertown's methane factory becoming damaged and causing explosions, ending at the hideout of the same pilot that attacked Max in the beginning of the movie. Max coerces him to help them escape in the Captain's Transavia PL-12 Airtruk, but there is too much weight and not enough runway between them and the attackers' vehicles, so Max takes a truck and drives it in front of the airplane, smashing a hole in the roadblock enabling the children to escape. Aunty finds Max, and having earned her respect, spares his life.