When they are given the Social Security number of a teenager who was killed two years ago, Reese and Finch begin to question the infallibility of The Machine. Meanwhile, Finch flashes back to The Machine's origin and how it was developed.
A massive tsunami hits the Santa Monica Pier, placing Buck and Christopher’s lives in danger.
Athena, Maddie, Bobby and the 118 races to save lives after a massive tsunami hits the Santa Monica Pier and Buck fears the worst when Christopher goes missing.
When an emotionally distraught man holds Maria hostage at gunpoint in an interrogation room after she served him with a restraining order, Danny must try to meet his demands before he harms her. Meanwhile, Frank is faced with a personal and moral dilemma when Garrett asks for help in dropping charges filed against his son. Dominic Fumusa guest stars.
With only a few days before Joe Carroll’s execution, Ryan and Mike shift their focus to a new threat. Meanwhile, after being approved to start work again, Max rejoins the task force and comes dangerously close to a deadly menace.
