Captain Bill Lonagan, Robert Ryan, and his co-pilot Joe Brooks, Keith Andes, pilot a Douglas DC-2 on a tense, crowded flight from a tiny South American airline toward Boca Grande. Onboard, Jud Ellis, Gene Barry, moves with the air of privilege he’s known for, escorting his new fiancée Louise Melhorn, Phyllis Kirk. Also traveling are Vasquel, Rod Steiger, a self-proclaimed student of people who is being transported back to the authorities by bounty hunter Crimp, Fred Clark; Pete Boswick, Jesse White, a mobster accompanying the boss’s son Tommy Malone, Jon Provost; the elderly Professor Henry Spangler, Cameron Prud'Homme, and his wife, Martha Spangler, Beulah Bondi; and Rena, Anita Ekberg, bound for work at a South American casino. The flight is already crowded with uneasy dynamics and unspoken tensions, setting the stage for the crisis to come.
As the jet climbs, a local at the airport tries to hawk a shrunken head to Tommy, a moment that unsettles Louise and exposes the social rifts among the passengers. Vasquel, a keen observer of human behavior, entertains the others with unsettling anecdotes about cannibals and head shrinking, while Crimp reads aloud a newspaper article about the murder of Tommy’s father, hinting at the darker undercurrents the group carries with them. The mood on board is volatile: Ellis remains ever self-serving, provoking friction, and Lonagan tries to keep a lid on mounting tensions, even as the storm outside intensifies. The group’s personalities clash, especially Ellis and the quiet, capable Brooks, who becomes a bright point of moral contrast as he quietly earns Louise’s attention and respect.
The weather rapidly transforms into a life-threatening ordeal. A violent storm batters the aircraft, a gun-toting Crimp loses his revolver, and a dangerous leak materializes—a portable oxygen tank becomes dislodged and tears through a fuselage door. Maria Alvarez, [Adele Mara], the stewardess, plunges to her death while trying to shield Tommy from the broken door. A fire ignites in the cockpit, forcing an emergency landing in a remote jungle clearing. The immediate crisis shifts from external danger to the fragile, volatile human dynamics that survive the crash, with the group attempting to repair the plane amid dwindling supplies and time.
In the aftermath, the survivors face a grueling, isolated struggle for survival. Crimp, eager to regain control, is thwarted by Vasquel, who reveals that he holds Crimp’s revolver and then hands it to Captain Lonagan as the lawful authority of the stranded party. The bond between Lonagan and Brooks grows as they confront the limits of their resources and the moral weight of the decisions they must make. Vasquel’s intellect and resolve become a sobering counterpoint to Ellis’s relentless self-interest, while Louise and Brooks form a connection shaped by shared vulnerability and mutual respect. Rena’s path intersects with Tommy’s, and the two navigate the complexities of desire, danger, and deception in a situation where trust is scarce and survival is paramount.
With time running short, the group’s only hope lies in repairing the plane enough to escape the jungle’s edge. The crew’s labor is intense but eventually bears fruit, and only five people can be evacuated on the aircraft’s single functioning engine: Tommy and four adults. One by one, the others step forward to sacrifice themselves for the others, showcasing a mix of courage, practicality, and painful compromise. Vasquel, who has asserted himself as the logical choice and protector, selects the remaining passengers who will stay behind, and a tense struggle ensues when Ellis lunges for the gun. In a decisive and brutal moment, Vasquel is forced to shoot Ellis to prevent further chaos, preserving the lives of the Spanglers and the others as the aircraft manages to take off with five aboard.
As the desperate plane ascends, the jungle pressures close in, and the headhunters loom as a final, ominous threat. Vasquel’s last act is one of grim mercy: he uses the last two bullets to save the elderly Spanglers from a torturous fate, then prays as he faces an imminent, brutal death. The survivors press on, leaving the fate of Vasquel and the fate of those who stayed behind to the merciless pace of the jungle and the relentless pull of gravity—an ending that lingers with the quiet desperation of people who have chosen dignity over despair in a moment when every choice could be their last.
