Albert Chung

Hart (Jennifer Beals) takes a solo mission to track down the mentor who betrayed her, and the team tries to locate her before it's too late.

It's a race against time as Darius must accelerate his plan to stop the asteroid before the Pentagon shuts him down. Also, Grace has to make difficult decisions that could have life or death consequences for millions of people, and Liam and Jillian reunite under surprising circumstances.

Darius, Grace and Harris join forces to prove the president was murdered. Also, Grace tells Zoe the truth.