The Puppet Masters

Sam is Andrew's son and a capable CIA agent who helps lead the response to the alien invasion. He is resourceful and skeptical of the alien hive, struggling with the parasite's influence while balancing loyalty to his father, colleagues, and Mary. He demonstrates resilience, courage, and a readiness to risk himself to protect others.

A high-ranking CIA officer who leads the mission against the invasion. He is authoritative and strategic, but the threat eventually tests his methods and pushes him toward drastic actions. Infected later in the story, his transformation intensifies the conflict with his son.

Leader of the SWAT team who remains calm under pressure and acts as a practical bridge between field agents and the investigation. He is loyal to his team, fearless in combat, and steady in the face of escalating danger.

NASA specialist who seeks to understand the alien biology and helps devise a plan to counter the invasion. Her scientific curiosity and courage drive critical moments, including the use of electrical shocks to disrupt the parasites. She also develops a personal connection with Sam, increasing the emotional stakes.

A seasoned agent who becomes a focal point in the discovery of the infection's reach. His actions and eventual fate highlight the existential threat and the psychological toll on those investigating the alien presence.

Lead medical researcher who provides crucial insight into the aliens' biology and helps conceive strategies to defeat them. His pragmatic approach and scientific expertise guide the team through complex challenges.

Apartment manager who becomes entangled in the aliens’ plans, facilitating infection spread through access and contact with the infected. His role underscores how ordinary people can become unwitting conduits for an alien hive.

The U.S. president who weighs military intervention and public safety against civil liberties. His decisions propel the plot toward a full-scale response to the alien threat.

A senior military figure pressuring for aggressive action to clear the infection and protect national security. Represents the military response to an unprecedented biological threat.