A doctor finds himself amid escaped inmates who pressure him to either save a fellow inmate suffering from a strange illness or face death.
Hailey experiences painful memories when he returns to Detroit, his hometown, to battle an unusual strain of cholera.
When neighbors get sick, the team suspects a government installation of having a hazardous-chemical leak.
Taft (Bradford Tatum) is called to investigate flesh-eating bacteria while visiting his sister and nephew (Christine Healy, Ladd York) in Chicago. Guest star: Dawnn Lewis.
Foul play is suspected when users of a new herbal diet begin experiencing life-threatening symptoms. With Bradford Tatum, James Black and Michael Harris.
The team goes to Los Angeles to track the cause of an outbreak which hospitalizes eight people with the same symptoms.
Hailey falls for a young rock star as the team investigates strange deaths by catastrophic bone demineralization.
Dr. Cassian drafts a reluctant new member onto the team -- a doctor who could help uncover the cause of a sudden brain tumor.
An elderly man confesses he was part of Hitler's SS and carries inside him a capsule holding the key to the Third Reich's rise to power.
Marcase, Hailey and Cassian use top-secret technology to find Shiroma after she's kidnapped by a serial killer.
A bio-terrorist contaminates the blood supply in Orlando, Fla., with a deadly form of malaria and kidnaps the director of the blood bank.
The team travels to Mexico to infiltrate a compound where Dr. Cassian's desperately ill niece has traveled in search of a self-proclaimed magical healer.
As Cassian faces death, the team searches for an antidote to a deadly virus the scientist discovered years earlier with his lover.
The team works to uncover a secret program in which death row inmates have been used to bring back messages from the other side.
The team battles the in-flight outbreak of a deadly virus during the trip home from a small island country.
When children start dying by spontaneous combustion, all suspicions lead to a pharmacy with a history of testing unapproved drugs.
The biohazard team (Jeffrey Dean Morgan, Tamlyn Tomita, James Black) investigates a traveling religious festival that leaves dead bodies in its wake.
The biological-crisis team goes to Chicago where a skyscraper's occupants hallucinate and commit suicide.
Government scientists cooperate to fight a deadly virus; with Jeffrey Dean Morgan; Tamlyn Tomita; James Black.