Gavin and Ty are at Eve's favorite spot, the wisdom tree. Gavin is relieved to have the chip but is distrustful about who's on the other side of the computer. Ty also suspects Eve's capturer is related to the secret project.

Izzy talks to Veronica about her new relationship with Leyla and how to priortize everything in 10,000 BC. Gavin needs Izzy, and he shows her and Ty the latest message, which says to bring the chip to Cavenga Peak before sunset.

He and Ty tell Maya the message, but Gavin needs time to think.

Sam finds Lucas in the woods. He thought Lucas was about to run off and find Scott alone. While Lucas is angry and worried about Scott, he wants a few minutes to tell his mom about the baby.

Maya follows Gavin. When he announces he is going to destroy the chip, she pulls a gun on him. Chaos ensues as Ty and Sam arrive with guns. Gavin says she overplayed her hand when she insisted on the trade and realizes she only cared about the memories of the chip.

When Veronica drops something in the council room, she finds a secret passageway, and inside is an Air Force radio. She and Lucas suspect there is a traitor within the fort.

As Scott is thrown into a cell, he sees that Levi is there and alive. Levi mentions they keep interrogating him about Gavin. Scott informs him that Maya is a traitor, and Levi urges him to think of something that might help with their release. The guards come for Levi again.

Soldiers arrive to help Maya with Gavin, Sam, and Ty, who fight back. Someone shoots at the soldiers. It's Helena who arrived through the aurora. She's angry that Maya got the chip and tells the guys Maya plans to sell her plan to the highest bidder.

Ruth wants to address these kidnappings, but Joseph doesn't care because the "sky people" are putting the fort in danger. Ruth defends Veronica, and then Veronica accuses one of them of betraying them, citing what she found.

Ruth calls for a recess, but when Veronica and Lucas try to talk to her, they learn she left abruptly.

Izzy thanks Leyla for getting to go hiking. They share a moment until they find dead soldiers, and Izzy panics, worried about her dad. Leyla comforts her, saying she is an excellent tracker.

When Maya returns to the base, a cute guard greets her and brings out Levi. It almost looks like he's working for her.

Levi returns to the cell with the chip, and Scott is suspicious. Levi tells him he joined Rysander because it was the only way to return to 10,000 BC, but he's not on their side.

Scott doesn't trust Levi, but Levi needs him to play along as Maya arrives. Levi interrogates and tortures Scott about his paper and suggests moving him to the long-term detention center.

Gavin tries to apologize to Helena, but she's mad that she took the heat for everything and she never met his family. An alligator attacks and Elena goes under. Gavin jumps in, too, and saves his sister.  She's grateful, and he promises she will meet the family this time.

Sam finds tire marks, so they are near the base.

As Lucas and Veronica confront Ruth, they realize she's covering for someone. Leyla takes Izzy to the double aurora because she wants to start a new life with her in 2021, but Izzy is suspicious and doesn't want to leave their families.

Veronica, Ruth, and Lucas arrive, revealing that Leyla was working with Maya and Maya lied. Leyla said that Maya swore no one would get hurt. Lucas and Ruth beg her to fix this, so they spy on the radio and hear that the military has acquired four targets.

Levi and Scott start towards the detention center. Levi tells Scott that Eve is being held there. Izzy spots Levi and Scott. A guard tries to shoot her, and Levi attacks him while another kicks Scott.

Chaos ensues. Another guard pulls a knife on Scott, but Lucas arrives and attacks him. Izzy tells them about Gavin, but Levi won’t let her come because these are trained soldiers. He kisses her and runs off.

Levi spots the soldiers and shoots them, giving his friends a chance. Another shoots him, and Izzy tries to stop it with her bow, but the gunshot gets through. Gavin and Izzy struggle to say goodbye. In his final moments, Levi tells them where Eve is.

The entire crew finds the double aurora and realizes Eve, Josh, and Riley are in 1965. Sam, Gavin, Izzy, and Helena head there to find them and destroy Maya's infrastructure.