In the Season 3 episode " Destination Unknown " of Manifest , the Stones navigate a "Lifeboat" theory where passenger actions could doom everyone, leading Ben and Michaela to stop a desperate Rachel Hall from harming her abusive ex-husband. Meanwhile, Saanvi makes a groundbreaking discovery at Eureka, finding a divine, sapphire-based connection to the flight's mystery on a piece of ancient driftwood, while Cal faces personal struggles with his powers. The episode concludes with a terrifying vision for the family. You can explore the full recap on TV Fanatic or read user discussions on Reddit . Manifest Season 3 Episode 8 Recap: Destination Unknown