An explosive assignment results in some new agent trainees being sent home; as Alex continues working to clear her name, she encounters Raina and Nimah, who provide more questions than answers.
One of the twins is seen at Grand Central two days before the bombing. When Simon and Alex find one of the twins, she explains how they have infiltrated a terrorist group across the street and are trying to find out when the next attack is planned. At Quantico, the trainees face a crucial test where they are locked in a classroom with a bomb left by Brandon Fletcher. The trainees work together to unlock the door, but are unable to defuse the bomb in time. However, they find out that the bomb is a fake. Trainees who stayed back with the team have passed the test and demonstrated their readiness to sacrifice themselves for the country. Caleb is officially reintroduced as a NAT recruit after the incident with Eric in the beginning of his training at the academy and the twins are officially introduced to the class. In the present, Natalie suspects Ryan of helping Alex, so she tracks him and leads the FBI to Alex. While trying to apprehend Alex, the FBI raid puts the twins and their operation in danger.
- Priyanka Chopra as Alex Parrish
- Josh Hopkins as Liam O'Connor
- Jake McLaughlin as Ryan Booth
- Aunjanue Ellis as Miranda Shaw
- Yasmine Al Massri as Nimah and Raina Amin
- Johanna Braddy as Shelby Wyatt
- Tate Ellington as Simon Asher
- Graham Rogers as Caleb Haas
- Anabelle Acosta as Natalie Vasquez
- Rick Cosnett as Elias Harper
- Mark Pellegrino as Deputy Director Clayton Haas
- Jacob Artist as Brandon Fletcher
- Michael Aronov as Hamza Kouri
- Emmanuel Kabongo as Kamran Tahan