NBC | 8:00 pm

In the two-hour Season 3 finale, "Mayday," the Stones are reunited with Olive (Luna Blaise), but their collective joy is curtailed by the discovery that Cal (Jack Messina) has run away. As a lack of trust curdles Michaela's (Melissa Roxburgh) relationship with Jared (J.R. Ramirez), she and Zeke (Matt Long) race to keep a passenger from taking potentially deadly action. Elsewhere, Ben and Saanvi (Josh Dallas, Parveen Kaur) tackle a risky mission to save a loved one.