Ty and Sam try to convince Gavin about the sinkholes, who think they should warn people. Ty explains that Gavin worked on a top-secret project at the Air Force base, and they need his help getting more info on that first, but Gavin doesn't remember any secret project.

That memory is blocked. He disappears into the restroom. Sam is worried about Gavin's drinking, while Ty is concerned Gavin is afraid of facing his issues. They have bigger issues because Gavin disappeared again.

At the Fort, Gavin remembered he used to deliver milk to that base after looking at the map. While Sam thinks it'll look different in 10,000 BC, Gavin maintains the mountains look the same. The guys want to get info from Maya but promise Scott they'll rescue Petra and Levi the next time.

Sam is worried about Gavin, but Gavin maintains there's something about his past leading him to this base.  A rhino approaches, and they run. Then, there's an explosion, and they're by a minefield right by the base. A soldier holds a gun on them.

Back in 2021, Ty and Sam split up to search for Gavin. Ty runs into his wife, Sophie, who's still furious at him since she never wanted a divorce and hates that now he wants to talk. He tries to apologize, saying the cancer made him cruel.

But she only remembers feeling like she failed at being a wife and a writer, even though he reassures her she's a great writer. He tries to warn her about stopping a mistake that night.

Gavin and Sam are tied to a tree when a woman with a knife releases them. Sam is suspicious, but she and Gavin recognize each other. It's Maya Schmidt.

She takes the men to the rocks and says she's looking for her daughter. They agree to help her find Petra, but Gavin has some questions first.

Maya didn't know Eve was missing. When the men persist about the secret project, Maya jokes since they all landed in 10,000 BC, it was a time-traveling program. She admits he was one of the first test subjects and that it was her job to erase those memories.

She also admits she now understands those consequences since when she was ready to reveal to the program, she and Petra were kidnapped. While they escaped, they are now separated.

She offers to help bring back some memories if it will help.

Izzy helps Leyla with hunting food. Leyla is becoming more rebellious like Izzy and says screw it to fitting into a mold. Leyla gets upset the hunting party left without her, but she's determined to get her own boar.

One comes, and Leyla pushes Izzy out of the way, but then Leyla ends up in the tarpits. Izzy grabbed a branch to try and pull her out, but the branch broke.

Veronica tries to plead Lucas's case to Ruth about wanting to be on the leadership council, but that only shows Ruth what a good person Veronica was.

Izzy tries to light a fire so someone will find them. Leyla admits she never shot a boar and is afraid she'll never be a warrior. She says the only person who understood her was her twin brother.

In 2021, Sam found Gavin. Ty gets a drink, does some reverse psychology on Gavin, and tells him about his problems and how Sophie had issues with pills and alcohol, and unless something changes, she'll die from a drunk driving accident that night.