Set in a hauntingly ambiguous year during the 1820s, the story opens with Hugh Glass (Leonardo DiCaprio) speaking to his son, Hawk (Forrest Goodluck), in the Pawnee language. He reassures Hawk that although fear is understandable, one must continue fighting as long as life remains. Flashbacks reveal Glass's past—a serene life with his Pawnee wife and son, tragically shattered when their home is set ablaze.
As we shift back to the narrative, Glass and Hawk navigate a river alongside their hunting party, comprised of rugged fur trappers led by Captain Andrew Henry (Domhnall Gleeson). The tension escalates when a wounded, arrow-impaled man stumbles into their camp, followed by a ferocious attack from the Arikara Indians, who are in pursuit of the kidnapped chief's daughter, Powaqa. The hunting party retaliates, but chaos erupts as Glass finds himself in a near-fatal fight, only to be rescued by his companions.
Abandoning their boat, the group journeys on foot to Fort Kiowa. Disturbingly, John Fitzgerald (Tom Hardy) begins to harass Hawk due to his mixed heritage, but Glass stands firm, urging his son to remain strong and unprovoked.
The hunting party soon faces a harrowing encounter when Glass is viciously attacked by a grizzly bear, a battle that leaves him gravely injured. Despite his attempts to defend himself, the bear inflicts terrible wounds before Glass manages to kill it. The men find Glass, but as they carry him, his condition worsens. Fitzgerald suggests they leave him behind, sparking a moral struggle within the group. Captain Henry offers a reward for someone to stay with Glass, prompting both Hawk and Jim Bridger (Will Poulter) to volunteer, even as Fitzgerald tries to undermine their resolve.
In a heartbreaking twist, Fitzgerald attempts to end Glass's suffering himself but is thwarted by Hawk's intervention, resulting in a fatal confrontation that leaves Hawk severely wounded. Fitzgerald ultimately entombs Glass beneath the earth, leaving him for dead as he and Bridger depart to rejoin the rest of the party.
Against incredible odds, Glass awakens and stumbles through the hostile wilderness, consumed by a singular desire for vengeance and survival. He finds his son’s lifeless body and vows to honor his memory. In a raw display of determination, Glass begins to fend for himself, scavenging for food and warmth and eventually setting up camp in the remains of a dead horse.
With the relentless pursuit of the Arikara still hot on his trail, Glass encounters a Pawnee warrior who shares a bond over their shared grief, offering Glass guidance and performing a healing ritual for his wounds. Yet, tragedy strikes again as Glass wakes to find his new ally executed by the French fur trappers.
Powerfully motivated, he infiltrates their camp, rescuing Powaqa, the woman the Arikara seek. Glass's relentless spirit manifests through a series of desperate escapades as he faces nature's treacheries, the forces that betrayed him, and the remnants of his lost family.
In the climactic finale, Glass confronts Fitzgerald, leading to a visceral showdown that culminates in Fitzgerald's fate being decided not by Glass's hand, but by justice served through the very people Fitzgerald disdained. In a heart-wrenching conclusion, Glass, despite having avenged his son's death, is left in solitude, burdened with the weight of his losses, as he collapses in despair, envisioning his beloved wife once more.
The final poignant image captures Glass overwhelmed with emotion, an embodiment of the human spirit battered but unbroken amid unfathomable loss and desolation.
