Scott is a highly skilled investigator, former spy, and trained psychologist. Orphaned at a young age and adopted by wealthy foster parents, his emotional detachment makes him an ideal recruit for a covert American intelligence agency known as the Division. He frequently struggles with the moral compromises his work demands, preferring to operate under aliases while battling memories of past trauma.

Ben is a decorated New York City homicide detective known for his heroism during the September 11 attacks. He walks with a pronounced limp from injuries sustained during his rescue efforts. Determined and analytically brilliant, he tracks down Murdoch's true identity, forcing the former spy to confront his past and bringing them together as allies.

Zakaria is a radicalized doctor and highly capable extremist whose life trajectory shifts dramatically following his father's execution by the Saudi state. Devastated by the loss and alienated from his family's increasing Westernization, he participates in the Soviet-Afghan war before conceptualizing a devastating plot against the United States. He is methodical, highly intelligent, and driven by an uncompromising ideology.

Leyla is a thorough, fluent, and highly professional Turkish police detective assigned to investigate a suspicious death in Bodrum. She balances her demanding career with profound devotion to the young boy she cares for, and she fiercely resents the presence of a foreign intelligence agent interfering with her jurisdiction.

Dave McKinley serves as the director of national intelligence, a position that requires managing enormous stress and executing highly covert operations. He earns his nickname due to his perpetually soft speaking voice. Recognizing the severity of a new biological threat, he relies on his deep administrative power and places specific trust in Murdoch's unique capabilities.

Bill is an immensely wealthy businessman who raises Scott in a massive Connecticut mansion. Driven by a deep conviction that his adoptive son has a unique destiny, he instills in Scott a complex sense of morality and duty. A passionate art collector, Bill's influence and resources continue to shape Scott's life long after his passing.

Grace is Bill Murdoch's wife and Scott's adoptive mother. She maintains a degree of emotional distance from the boy, initially opposing Bill's determination to bring the orphaned child into their affluent household.

Marcie is Ben Bradley's devoted wife. Recognizing her husband's profound struggle after his September 11 experiences, she purchases a forensics book to help rekindle his passion for investigative work.

James is the President of the United States, a former businessman who ascended to the presidency following the sudden death of his running mate. He approaches global crises with a sense of patriotic duty and relies heavily on his clandestine advisors to manage complex threats.

Battleboi is a highly skilled hacker of Latinx descent currently working as a cooperating witness to avoid federal prison. Eccentric and deeply knowledgeable about digital footprints, he provides Murdoch with crucial technical support to erase identities and trace secure communications.

Rachel is Battleboi's partner who shares his affinity for medieval Japanese aesthetics. She provides emotional support for him during his legal troubles and cooperates with his eccentric lifestyle.

Dodge is an American billionaire and heir to an automotive fortune. Known for utilizing recreational drugs, his fatal fall from the cliffs of a seaside mansion serves as the focal point for Murdoch's cover investigation in Turkey.

Cameron is Dodge's young, beautiful widow. Bound by a strict prenuptial agreement, she faces intense scrutiny following her wealthy husband's plunge from their rented estate, maintaining an alibi while managing the police investigation.

Ingrid is a strikingly beautiful and intense American woman staying near the French House. Characterized by her sharp wit and defensive demeanor, she draws Murdoch's intense scrutiny as he investigates the circumstances surrounding Dodge's death.

Abdul is a fearsome and legendary Afghan war leader known for his brutal treatment of traitors. He recognizes Zakaria's military prowess and provides the young fighter with vital resources, forged documents, and funds to continue his ideological campaign.

He is a devout Muslim and a marine zoologist specializing in clownfish. His vocal criticism of the Saudi monarchy's corruption leads to his arrest and execution by the state.

She attempts to hold her family together following her husband's execution. Her decision to seek employment and adopt more Westernized practices in Bahrain alienates her conservative son.

He is a young boy with Down syndrome who lives with Leyla in Turkey. He frequently accompanies her to the park and becomes a point of interest during Murdoch's investigation.

Bashar is a former Syrian police torturer who serves as the deputy director of a medical institute. His physical build makes him the unfortunate target of a targeted kidnapping designed to breach the facility's biometric security.

Ahmet is a cynical but highly talented bass player working at a luxury hotel in Bodrum. His knowledge of a rare folk instrument draws him into Murdoch's intense investigation.

Walter is a virologist at the US government's top research facility for infectious diseases. He hopes his terrifying discovery regarding a lethal, engineered virus will bring him professional fame.

Christos is a member of a prominent Greek crime family involved in money laundering. His illicit operations attract the lethal attention of Murdoch's covert agency.

He is the patriarch of a Greek crime family who harbors an eternal grudge against the American intelligence agency after they dispatch female assassins to eliminate his son, viewing it as a profound insult to his family's honor.

Bucher is a wealthy Swiss banker whose institution facilitates corrupt financial transactions. Murdoch ruthlessly exploits his family ties to secure necessary financial data.