Cadence is a 16-year-old girl suffering from dissociative fugue amnesia. She relies on her instincts and muscle memory from martial arts training to survive a terrifying ordeal in the woods. Though she starts out confused and frightened, she shows deep resourcefulness, even disguising herself as a 13-year-old boy named Nate to evade her pursuers while attempting to piece together her fragmented past.

Ty is a teenage boy who works fast food and studies online to become an emergency medical technician. After his mother kicked him out for damaging his stepfather's car, he experienced homelessness before rebuilding his life in a shared apartment. He provides crucial assistance to Cadence, risking his personal safety to help her evade capture.

Brenner is a computer scientist at Z-Biotech who takes on the role of Cadence's captor. He works on the orders of his corporate superiors, motivated by a significant financial payout rather than morality. He sustains physical injuries when Cadence fights back and escapes his custody.

Nowell is the president and chief executive officer of Z-Biotech. He acquired the research company with the intention of weaponizing a newly discovered hantavirus for the black market. Driven entirely by greed, he directs his employees to silence anyone with knowledge of the vaccine formula, making him the architect of Cadence's suffering.

Elizbeth is the senior vice president of marketing at Z-Biotech. She operates with cold calculation, actively assisting corporate efforts to secure the biological weapon data. She utilizes deception and manipulation to track down the missing virologists and their valuable formula.

Janie is a renowned virologist at Z-Biotech and Cadence's mother. After discovering a deadly hantavirus and developing its vaccine, she learns of the company's sinister plans to sell her research as a weapon. She goes on the run to protect her family and gather incriminating evidence against her employers.

Patrick is a skilled virologist at Z-Biotech and Cadence's father. He works alongside his wife to prevent their research from being turned into a biological weapon. He takes his young son into hiding while attempting to expose the corporate conspiracy that threatens his family.

Max is Cadence's three-year-old brother. He accompanies his parents when they flee from their dangerous employers, becoming a central figure in Cadence's internal drive to survive and reunite with her family.

James is Ty's roommate who works at a hair salon. Initially skeptical about harboring an unknown girl with a wild story, he uses his styling skills to disguise Cadence by chopping off her hair and changing her appearance to avoid detection from the men searching their building.

Officer Dillow is a middle-aged police officer stationed at the Newberry Ranch resort. He initially questions Cadence about her injuries, but detains her after receiving a phone call claiming she is a runaway patient from a teen mental institution.

Audrey is an employee at a local coffeeshop. Having experienced homelessness herself, she shares a bond of mutual support with Ty, who was once in a similar situation on the streets.

Spot is the pet dog living with Ty and James at their apartment complex.