Australian filmmaker George Miller has been shaping our vision of a post-apocalyptic future for the past 45 years, since his “Mad Max” roared onto screens in 1979. His 2015 installment “Mad Max: Fury Road” could be one of the best films of the 21st century, a dusty, fuel-injected chase across the desert that synthesizes everything wrong with a toxic patriarchy in which an elite ruling class hoards resources while exploiting the bodies of women and young men, dehumanizing the poor.

Max (Tom Hardy) may have received top billing, but the breakout character of the Oscar-winning “Fury Road” was Furiosa (Charlize Theron), a grizzled war rig driver who shows up with one arm, a thousand-yard stare, and an impressive military title: “Imperator.”

Furiosa’s history was alluded to but not fully explored in the lean, mean “Fury Road,” but her rich backstory now makes up Miller’s prequel, “Furiosa: A Mad Max Saga.”

This is another sprawling-tale of gas-guzzling automotive-based mayhem, where warring tribes in the desert Wasteland worship at the altars of cars and motorcycles and spill blood over gas and bullets. But “Furiosa” is a bigger movie than “Fury Road,” taking place over the course of many years, not just a couple of days. If “Fury Road” was a snapshot that suggested a whole world of lore, “Furiosa” is an epic poem, with Miller and co-writer Nico Lauthouris structuring this saga into chapters.

Immortan Joe (Lachy Hulme) remains an antagonist, ruling the Citadel with his horde of slavishly devoted War Boys, keeping a harem of breeder wives, but Furiosa’s true enemy is Dementus (a prosthetically enhanced Chris Hemsworth), a bonkers biker who roams the Wasteland with a nomadic tribe of followers.

Immortan Joe is control, and Dementus is chaos, careering around the Wasteland in his motorcycle chariot, enforcing his power with torture and violence. He is uncharacteristically vocal for this world, using a microphone to speechify to his followers, a few of whom have snatched a young Furiosa (Alyla Browne) from her idyllic matriarchal home, the Green Place. In a stunning extended opening, Furiosa’s mother (Charlee Fraser) tracks the kidnappers across the desert on motorcycle, in a desperate bid to get her daughter back, and to protect the Green Place from exposure to these warlords.

As we knew she would, young Furiosa ends up at the Citadel, traded away in a deal Dementus makes with Immortan Joe for control of Gastown. Marked for duty as a future breeder wife, scrappy Furiosa remains determined to survive and escape. She conceals her gender and as she she gets older (now played by Anya Taylor-Joy) she finds her place as a black thumb mechanic, brooding over revenge, concealing a peach pit as a symbol of hope for her future.

Hope is a funny thing, the most limited resource in the Wasteland. Furiosa finds a scrap of it in Praetorian Jack (Tom Burke), who teaches her the art of the war rig, but time and again, her hope is snatched away by Dementus, whose chaos infects the Wasteland, his bikes kicking up dust like a swirling sandstorm that will never die down.

Taylor-Joy has a challenging task stepping into Theron’s shoes, inhabiting such a taciturn character whose emotional battles are largely internal. While Theron was haunted and sorrowful, Taylor-Joy is steely and silent, juxtaposed against the florid, flamboyant Dementus, an outsize role and performance that is easily the best that Hemsworth has ever delivered.

If “Fury Road” is the tale of liberation, “Furiosa” is how she got there, and our heroine’s story is absolutely worth witnessing.

(“Furiosa: A Mad Max Saga” contains sequences of strong violence and grisly images)/Tribune News Service

‘FURIOSA: A MAD MAX SAGA’

Rated R. At the AMC Boston Common, South Bay Center, Causeway, Alamo Drafthouse Seaport, Landmark Kendall Square Cinema and suburban theaters.

Grade: A-