Overview

• Station 118 firefighters respond to a fire at a biomedical research lab housing lethal viruses, including Crimean-Congo hemorrhagic fever, described as 'Ebola's nastier cousin.'
• An explosion traps Bobby, Hen, Chimney, and Ravi three stories underground, triggering emergency lockdown protocols and complicating rescue efforts.
• Scientist Moira, recently fired from the lab, is revealed to have stolen the only antidote and engineered a faster-acting strain of the virus, worsening the crisis.
• The U.S. Army cancels extraction plans after learning of the accelerated virus strain, leaving the firefighters stranded and in grave danger.
• The episode concludes with a cliffhanger as Chimney's symptoms worsen, the antidote remains missing, and the team's fate hangs in the balance.