The consequences of Ben's actions tests his marriage and sends Grace reeling. Michaela makes a difficult decision regarding Saanvi's secret. Cal, following his intuition, provides secret refuge to an outcast.

Ben’s pursuit of a vulnerable Passenger’s Calling lands him in the crosshairs of an enemy. Michaela unearths a dangerous arsenal of 828 hate. A seemingly natural disaster leads Saanvi to make a bold move. Angelina puts her connection with Eden to a dangerous test.

Ben reunites with a duplicitous foe. Michaela and Zeke's dinner party with Jared and his new girlfriend is halted by a calling that ignites the Stone siblings to save the life of one of their own. Olive's friendship with Levi blossoms but is tested.

As Mick and Ben join forces to aid a desperate Flight 828 passenger, Saanvi grapples with a discovery at Eureka, and the burden of secrecy that comes with it. Grace and Angelina's bond deepens. A maturing Cal enlists Zeke's help in a personal matter.

Mick questions Ben's developing relationship with Eureka. A new adversarial group suspicious of Ben takes drastic measures to gain answers. Saanvi proves her worth through a scientific breakthrough. Angelina reaches a breaking point.

Jace zeroes in on Cal's location as others try to prevent a tragedy. A missing piece of the parchment leads to a surprising revelation.