But Gavin pauses at the edge of the rift, looking back. He sees a vision of Eve, smiling, standing beside the heart. He whispers, “I’ll find you again. In every time.”

Battle erupts at the cavern. Lucas sacrifices himself to destroy Maya’s command center, trapping her in a collapsing side rift (her fate left ambiguous). Ty and Veronica lead the survivors in a desperate last stand.

They’re attacked by a new tribe: , humans who worship the rift technology and believe closing it will unmake existence. Their leader, Zane (played by Alex Meraz), captures Sam and Veronica. Zane reveals he is also “rift-touched” — a descendant of the Ancestors — and that Eve’s return was a trap. “The rifts chose your family, Gavin,” Zane sneers via a psychic link. “But you’ve been closing doors that should stay open.”

Back in 2021, Josh finds himself alone in a quarantined L.A. The sinkhole site is now a high-security government lab run by a ruthless new director, (new series regular, played by Nimrat Kaur). She believes Josh’s DNA — part of Gavin’s “rift-touched” bloodline — is the key to controlling the ancient anomalies.

In 10,000 BC, the survivors — led by Sam (Jon Seda), Ty (Chiké Okonkwo), Veronica (Lily Santiago), Riley (Veronica St. Clair), and a guilt-ridden Lucas (Josh McKenzie) — realize the aurora borealis that brought Eve back has vanished. They’re trapped. But a seismic tremor opens a chasm near the village, revealing a buried military bunker from the 1950s.