Explorer Colin O'Brady hosts the Blasingames from Gadsden, Alabama, and the Elliotts from Boulder, Colorado, in a grueling three-day, 16-mile expedition through dense brush and jagged peaks. The Elliotts want to see their daughters, who have drifted apart, reconnect. The Blasingames are looking for reassurance that their eldest, Elijah, is ready for life away from home at college.