The film begins with a sweeping aerial shot of a desert, revealing a vehicle being towed by a caravan of camels. As the scene unfolds, a plane swoops low, causing its pilot, Jedediah, to jump out and land on the vehicle, managing to escape with the help of a monkey onboard, much to the distress of its driver, Max Rockatansky—a solitary figure making his way through the harsh desert landscape. In a moment of reflection, Max retrieves a small whistle from his boot, blowing it with a sense of ritual.
Later on, Max spots several similar desert vehicles approaching the remote city of Bartertown. He arrives at the gatehouse, where he meets The Collector, who is busy trading with newcomers. Max assertively demands entry for an hour to track down the pilfering pilot. In a tense standoff, he showcases his skills and earns a grudging acceptance from The Collector.
Once inside Bartertown—a chaotic mix of citizens and crooks—Max spies his lost vehicle, only to be intercepted by the flamboyant ruler, Aunty Entity. Their conversation takes a dangerous turn when Aunty signals her guards to ambush Max. To everyone's astonishment, he outmaneuvers them with ease, becoming the first outsider to survive her "audition." Max learns that Bartertown represents a fragile attempt to rekindle societal order after a cataclysmic nuclear disaster. The city thrives on a unique energy source, methane, obtained from pig waste mined by prisoner-slaves in a subterranean location known as Underworld.
Aunty Entity reveals her alliance with Master Blaster, a duo comprised of the imposing Blaster and the brilliant, diminutive Master, who controls the methane supply. As power struggles unfold, Aunty seeks Max's help to eliminate Blaster in a "fair" duel, promising to return his stolen goods as well as supply him with methane should he succeed.
Max's ordeal leads him to toil in the Underworld, where he encounters the branded "Pig Killer." Amid the grim labor, he learns about Master’s demands for his vehicle, which is rigged with explosives that Max refuses to disarm, igniting tensions in Bartertown. Eventually, forced to collaborate, Max defuses the bomb while discovering that Blaster is vulnerable to sound—a realization he exploits during the impending fight.
In the iconic Thunderdome, a combat arena, Max faces Blaster. The fight is intense but takes a turn when Max realizes Blaster's mental limitations, leading him to express his discomfort with the situation: > "This wasn't part of the deal." Despite the crowd's chants insisting on a definitive outcome, Aunty's guards execute Blaster, heightening the stakes as Aunty accuses Max of betrayal and subjects him to the Wheel of Fate, which condemns him to a desert exile.
Resilient yet battered, Max encounters his monkey companion, who provides him with water, but shortly collapses from exhaustion. He is rescued by Savannah, a desert survivor who resides among children, believed to be the descendants of a lost flight captain, Captain Walker. Confessing to his true identity, Max struggles against the children’s fervent belief in their promised paradise, “Tomorrow-morrow Land.”
His experience takes a darker turn when Savannah embarks with some children on a dangerous expedition towards Bartertown. Max follows, only for rescue efforts to end in tragedy as a child falls into a sinkhole. The lingering shadows of Bartertown lead Max and the children into a confrontation with the Underworld guards. They stage a daring escape using an old locomotive, with Aunty in hot pursuit.
In a climactic showdown, Aunty manages to seize Master, spurring intense confrontations on the train. As laws of the wasteland blare, Max devises a desperate plan involving Jedediah's plane for escape. Timing their actions perfectly, Max's daring leap off a speeding vehicle allows the plane to take off amidst chaos.
As Max is left alone in the stark desert, his fate remains uncertain. The narrative closes in the city of Sydney, where Jedediah and Savannah—now a new mother—set their hopes on the horizon, preserving a flickering light in anticipation of Max's return. The story concludes with a heartfelt dedication, “For Byron,” honoring Byron Kennedy, a pivotal figure in the Mad Max legacy.
