Michaela and Saanvi have a similar vision, but it takes them some trial, error and teamwork to heed the call; Jared takes the fall for Michaela's misstep at work; Ben comes face-to-face with the man who replaced him.

When Ben and Michaela put everything on the line to save the other missing passengers, the mission goes horribly awry and not everyone makes it out alive. The devastating result pushes Ben and Grace to a traumatic brink, while pulling Michaela and Jared dangerously close together.

Michaela uses her skills as a detective to find out more about Zeke, a hiker who disappeared in 2017 and may be one of them. Ben's family is impacted as public disdain for the passengers of Flight 828 rises.

Ben forms an alliance with a student from Flight 828, whose callings either uncovered a violent crime or helped him commit one. As Saanvi strives to further her research into the death date, Grace makes a startling discovery about her pregnancy.

Ben and Saanvi work together to orchestrate a surprising family reunion for an emotionally closed-off Flight 828 passenger. Meanwhile, Olive drifts further away from her family, Jared learns more about a growing cabal of anti-828 sentiment, and Michaela finds herself out on a limb when baggage from Zeke's past threatens to destroy his tenuous new life.

When Grace's pregnancy complicates the pursuit of a calling, Ben finds himself working alongside an uneasy new ally. Michaela tries to make amends with Jared, and the X'ers set their sights on Zeke.

A threat to the Stone family tests Michaela’s commitment to play by the rules and forces Grace to make a difficult decision. Ben enlists the aid of an old rival to save an old friend. Olive helps a new friend solve a calling that unearths a startling connection.

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.

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.

Cal tries to understand his scar. A Calling leads Michaela to 828 co-pilot Amuta, who sheds light on what he saw. Ben makes an emotional connection.

As the Stones race to find the Omega Sapphire, Ben finds hope in a Calling that reunites him with a familiar face. Zeke faces a difficult choice.

Michaela finds a welcome distraction in helping Jared with an investigation. Cal tests a new ability. Ben and Saanvi try to decode a mysterious message.

All signs point to the end of the Earth, spurring the Stone family and the passengers to work together and decipher cryptic clues before time runs out.