As Kirkman is running for office for the first time, Wells is reassigned for a critical matter.
Kirkman's team is caught up in a strong debate about child marriage. A biohacker alerts Wells to a terrifying new danger.
Privacy and transgender rights are in the spotlight as a result of a political attack on Kirkman.
In the midst of a flu pandemic, Wells notices a frightening connection.
Tensions mount after a terrible news story makes headlines, while Wells discovers proof of a plot.
A suffering Guatemalan kid in a Texas hospital raises the issue of immigration.
Seattle is threatened by a rogue Russian bomber, while Mars fights against a pharmaceutical company.
Kirkman launches a high-speed search for the bioterrorist. Lorraine brings the drug crisis into the campaign.
Falling behind in the polls, Kirkman considers pushing the FBI to take action in the bio-terrorist case.
On Election Day, Kirkman resorts to his therapist to calm his conscience over the crucial events in the preceding 36 hours.