Decay

Matt is a calm, steady presence among the scientists, offering practical judgments and moral support. He steps up when asked to stay in the control room and helps coordinate the group's response. He demonstrates loyalty to his colleagues, navigating danger with a level-headed approach. His behavior highlights the importance of teamwork in a crisis.

Connor is a quick-thinking, pragmatic physicist who often acts as a bridge between theory and action. He volunteers for dangerous tasks and pushes forward when others hesitate, showing courage and resilience. He demonstrates resourcefulness while working with the mainframe and navigating the tunnel under pressure. His pragmatism sometimes collides with protocol, revealing a willingness to take risks to save others.

Kate is James's girlfriend who becomes entangled in the crisis and is captured by the technicians. She quickly adapts to a dangerous situation and remains connected to the group's mission through threat. Her fate underscores the human cost of the scientific crisis and motivates others to survive.

James is a capable physicist who balances technical skill with caring for his team. He takes initiative during the crisis to help with the tunnel mission and support his colleagues. He is bitten by a zombie and ultimately killed by Connor to prevent further danger.

Amy is a brilliant data analyst who drives the core investigative work. She runs simulations to understand boson radiation and its potential to destroy brain tissue. She fights to breach the firewall and communicate with the outside world. Her evidence helps reveal the Director-General's responsibility.

Dr Niven is a cautious physicist who pushes for safety and urges careful assessment. He leads the field team into the LHC tunnel to diagnose the problem. He is a foil to the Director General's risk-taking and remains focused on procedural safeguards.

Director General is the controlling figure at CERN who prioritizes prestige over safety. He uses his authority to override warnings and delegates risky decisions, fueling the crisis with a ruthless, calculation-driven mindset. His actions drive the moral and political dimensions of the disaster.

Lisa is a capable administrator who was supposed to be in Barcelona but misses her flight. She remains connected to the crisis through communications with Amy and the outside world. Her voicemail becomes a key plot device to reveal the Director General's responsibility.