米凱拉在調查一個召喚時發現神祕偷渡客。班緊守他的信念。卡爾不再躲藏，只為追查一樁線索。

黑盒子的隱藏語音將莎薇捲入其中。卡爾溜去看被逮捕的亨利。班在上播客節目時尋求協助。

卡爾設法理解自己的傷疤。米凱拉因一個召喚而找到 828 班機的副機長阿穆塔，而他闡明當時所見景象。班找回情感連結。

出於令人心碎的原因，米凱拉和凱爾因共同幻象而聚首。與此同時，伊根提供了寶貴資訊給班，但有代價。

米凱拉、凡斯、傑瑞德和澤克在基地尋找班，最終導致爆炸性的對峙，以及一個神蹟。

卡爾守護祕密，伊根執行他自己的任務，米凱拉揭開悲慘兇殺，而每個人都不得不設法調適。

又發現一具屍體後，米凱拉和傑瑞德努力追查一名連續殺人犯的下落。卡爾去約會。澤克面對昔日心魔。

追捕殺人兇手的行動持續，而處境艱困的卡爾試圖證明自己清白。有人在逼不得已的情況下，接受莎薇在他身上測試一項理論。

一個不祥召喚打亂了米凱拉和澤克的派對。卡爾和班得知令人心碎的消息。米凱拉、莎薇和伊根找尋歐米茄藍寶石。

史東一家趕忙尋找歐米茄藍寶石，而班則在一個召喚中與熟面孔團圓，得到了希望。澤克面臨艱難抉擇。

As the passengers adjust to a frustrating new reality, Ben and Michaela seize an opportunity to solve a Calling, with the Registry in hot pursuit.

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.

As terrifying plagues descend on the detention center, Saanvi scrambles for a solution and Michaela steps up in a crisis. Cal attempts to reach Angelina.

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 passengers race to solve their Callings as Saanvi tests a theory on the patients. Eagan makes a surprising move. Michaela confronts hard truths.

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.

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