Mac Brandt

The agents get up close and personal with a biker gang after their lawyer is found dead. The evidence points to a carjacking gone wrong, but the agents soon unearth a number of suspects closer to home.

Clarke’s newfound romance with Finn is threatened. After suffering a blow to the head, Octavia wakes up to find a Grounder watching her. On the Ark, Abby exposes Kane’s plan to reduce the population of the Ark. Then Chancellor Jaha and Abby notice a signal and realize at least some of the 100 must still be alive on Earth.

When the team investigates the death of a sailor outside Baltimore, Tony sees a former police informant he thought was dead.

Kidd and Severide's honeymoon is interrupted by a dangerous person from their past; Kidd's former academy classmate joins Firehouse 51; Brett and Violet reflect on their relationships.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

A security guard foils a robbery when he kills one of the robbers; Jane and Maura work together to search for the robber's accomplice; Jane continues her quest to protect Maura and Angela.