When Flight 828 lands in New York, Michaela and Ben Stone and the other passengers learn that years have passed, but they haven't aged a day. They reunite with loved ones, piece together their old lives and deal with mysterious voices in their heads.

Flashbacks reveal how Grace, Olive and Jared coped with the loss of their loved ones after the disappearance of Flight 828; Ben tries to escape the voice in his mind by going on an adventure with Cal; Michaela struggles with her feelings for Jared.

When Cal is discovered missing from his bedroom, Grace and Ben launch a desperate search which takes them to the remote mountains of upstate New York. A tantalizing trail of breadcrumbs leads them to a startling, game-changing discovery. Meanwhile, Michaela confronts the deceptive Autumn, and the shadowy "Major" finally makes an appearance.

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.

Michaela, Ben, Zeke and Saanvi all have the same calling. After another panic attack, Saanvi is finally ready to see a therapist, but it may not be what's best for her. An ominous new link appears between Griffin and the 828 passengers.

As the Stone family reels in the aftermath of a devastating shooting, they’re hit with their most foreboding Calling yet, sending Ben on a mission to locate two Flight 828 passengers who have mysteriously gone missing. Grace grapples with her new pregnancy, the Major attempts to tighten her grip on the unwitting Saanvi, all while the clock on the lives of the 828ers continues to tick towards zero.

Ben is drawn to help absolve a passenger of his guilt, while Saanvi enlists help in protecting herself from the Major. Jared and Drea attempt to extract a confession from a trio of ruthless meth dealers who would do anything to exact revenge on Michaela.

Hidden voices on the black box draw Saanvi in. Cal sneaks to see an apprehended Henry. During a podcast appearance, Ben seeks help.

After finding another dead body, Michaela and Jared try to track down a serial killer. Cal goes on a date. Zeke faces old demons.

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.

Desperate to stop Angelina, Ben makes a risky move that yields unexpected consequences. A family emergency sends Michaela in a different direction.

Michaela and Jared make the most of their arrangement. Angelina receives support from Eagan. Panic grips the detainees amid devastation at the facility.

As the Death Date nears, Callings begin to take a toll on Cal. The group sends out a cry for help. A familiar face provides hope in an unexpected place.

The Death Date has arrived. As tensions erupt and revelations emerge, the passengers of Flight 828 reunite and face the unknown together.