Runtime
98 mins
Language
English

During a devastating war, three couples find themselves grappling with difficult choices that will change their lives forever. Len, Mia, Andy, Esther, Anna, and Erik are complex characters, flawed yet beautiful, as they confront a catastrophic, human-made biological disaster. The film explores whether love can endure even when the world is ending and profound sacrifices must be made.
Does Parts Per Billion have end credit scenes?
No!
Parts Per Billion does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of Parts Per Billion, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Teresa Palmer
Anna

Rosario Dawson
Mia

Gena Rowlands
Esther

Frank Langella
Andy

Josh Hartnett
Len

Hill Harper
Rick

Nazneen Contractor
Justine Prest

Alexis Bledel
Sarah

Penn Badgley
Erik

Ned Vaughn
CDC Spokesman

Richard Gilliland
Anchor 1

Greg Cromer
Reporter 1

Robin Atkin Downes
News Reporter

Theo Williamson
Muscle

Valerie Hurt
Tracy

Jon Prescott
Jay

Conor Leslie
Des

Stephen Sowan
Jabe

Reis Ciaramitaro
Terran

Sonya A. Avakian
Carol Goto

Holly Wingler
Jess

Carl Noel King
Jacob

Mike Carey
Hank

George Avgoustis
Lawyer

Evelyn Joy Pointer
Law Form Party Laby

Mia Diaz
Girl in The Future

Chad Morgan
Mother in The Future

Jeff Michael
Anchor 2

Donna Davidson
Religious Woman

Joe Cipriano
News Reporter

S. Leslie Julian
News Reporter

Hettie Lynne Hurtes
News Reporter

Beverly White
News Reporter
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Challenge your knowledge of Parts Per Billion with this fun and interactive movie quiz. Test yourself on key plot points, iconic characters, hidden details, and memorable moments to see how well you really know the film.
What is Erik's profession?
Musician
Scientist
Lawyer
Writer
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Read the complete plot summary of Parts Per Billion, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
Anna, Teresa Palmer, and Erik, Penn Badgley, are a wealthy, music-loving couple whose days are cushioned by Erik’s family fortune. Erik is a struggling musician more focused on his craft and keeping amicable ties with his exes than on the couple’s day-to-day life, while Anna grows increasingly anxious about the fragility of their seemingly comfortable existence. They clash over seemingly trivial details, yet the undercurrent of unease grows as Anna watches headlines about escalating conflicts in the Middle East. She begins to believe they should spend more time together, to anchor themselves against a world that feels increasingly volatile. But Erik drifts toward his composition and his social circles, and the distance between them widens, masking deeper fears with casual routines and shared, but shallow, routines.
Len, Josh Hartnett, is a depressed and unemployed writer whose life has lost direction, and Mia, Rosario Dawson, his wife and a capable lawyer, finds herself navigating a demanding career and a strained marriage at once. Their relationship rides an uneasy line as Len threads through his own insecurities, while Mia’s professional successes clash with personal stress. Len confesses to his sister, a nurse named Sarah, Nazneen Contractor, that he has taken Mia for granted and longs for a sense of purpose again. Mia, meanwhile, has just won a significant case representing Andy, a scientist of some renown, who is accused of selling trade secrets to a research facility in the 1970s. The news of Mia’s victory sits alongside Len’s quiet despair, painting a portrait of two couples moving through parallel yet divergent struggles.
Andy, Erik’s grandfather, Frank Langella, pushes Erik to take more money, insisting that the family’s wealth could be a safety net—or a burden. Erik refuses, determined to prove he can make it on his own, a choice that sparks a misunderstanding with Andy, who accuses him of being patronized by the legacy of wealth. Esther, Andy’s wife, Gena Rowlands, is more forgiving about the past, arguing that the money preserved a future for their daughter when the stakes were at their highest. She remains an eternal optimist, believing in a life beyond the immediate crisis, while Andy, a realist, temperatures his optimism with a sobering awareness of ethical gray areas in their history. As the world outside spirals, their family’s finances and loyalties become entangled in a web of memory, guilt, and survival.
Across the globe, tensions flare into a dangerous reality. Biological weapons are at first rumored to be deployed, then confirmed, and the United States urges calm while Europe reels from casualties as toxins drift west with the trade winds. The looming possibility of catastrophe pushes both families toward the edge. In a moment of practical fear, Sarah alerts Len, who then escorts Mia into their basement to shield them from the chaos as the phone lines fail and panic spreads. Rick, a determined survivalist, attempts to purchase a survival kit but cannot secure the funds in time; he is shot by a looter when his desperation outpaces his luck. The city’s anxiety becomes a palpable presence, a character in its own right, as people scramble for safety and scarce resources.
Back at home, Erik and Anna endure their own trial by silence. Andy and Esther survive the worst of the crisis by relying on oxygen tanks, a small lifeline in a world where every breath feels like a choice. Esther remains stubbornly hopeful that Erik and Anna have endured somehow, while Andy remains a realist who doubts their survival. Through flashbacks interwoven with their arguments, we glimpse Erik and Anna’s carefree early days—flirtations, intimacy, and the news of Anna’s pregnancy—moments that make the present crisis feel more personal and intimate. The flashbacks culminate in a stark image: the apparent deaths of Erik and Anna as they lie together, never fully knowing whether they will wake or see tomorrow.
In the present, Esther awakens to the grim reality of the hospital’s oxygen hunt while Andy pushes forward, determined to secure life in the face of overwhelming odds. They uncover Sarah’s body during a hospital run and are sobered by the loss of life that surrounds them. Esther’s spirit wavers, but Andy’s quiet resolve reminds her that they still have each other. The two lovers, Len and Mia, stand at a precipice in their own relationship: Mia admits a painful failure to protect a coworker who fell in love with her, and Len, wounded, implores her to stay and to fight for their chance at rebuilding a life together. They reconcile just enough to hold on, even as the world outside continues to turn toward an uncertain dawn.
The film’s final image centers on a haunting, almost mythic note: a young girl—one of the visions Anna has carried—discovers Anna’s ring and presents it to her mother. It’s a fragile, hopeful connection to a life that remains beyond the immediate danger, a spark that hints at renewed faith in tomorrow even as the present remains perilous. The story closes with a quiet sense that, despite the losses and near-misses, small moments of grace and resilience persist.
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