The stranded girls grieve one of their own. Meanwhile, we learn they're not the only ones ensnared in this social experiment-it turns out there's a male control group, marooned on a different island.

The girls struggle to adjust to their new camp, while food scarcity plagues the boys. Raf gains confidence thanks to a new friendship, but flashbacks reveal a dark side of his codependent nature. Leah makes an unexpected ally.

A brush with death rattles the girls. The boys must defend against a blood-thirsty predator. In a series of flashbacks, we learn more about Scotty and Bo, and why it's hard for them to trust the other castaways.

The boys continue to battle against the dangerous predator, and this time they plan a coordinated attack. A birthday on the girls' island puts everyone but Rachel in celebratory spirits.

Rachel seeks necessary closure, while Fatin makes an unsettling discovery in Nora's journal. Meanwhile, an incident comes to light that sends shockwaves through the boys' camp, altering their life on the island forever.

After expelling an alleged criminal from camp, the boys clash over how much mercy to show. Ivan's past choices have impacted his life and those around him. Leah's mind is playing tricks on her, while Martha's past comes back to haunt her.

The girls relocate to the hot springs, but the journey shatters the group and Leah is driven further into madness. The boys come to a truce, but it's upended when troubling secrets about their most controversial member come to light.