The Fringe team must find the pattern between tragic time loop anomalies. As the investigation unfolds, Raymond, an electrical engineer, and his wife Kate, a professor of theoretical physics, enter the picture.
"And Those We've Left Behind" is the sixth episode of the fourth season of the Fox science-fiction drama television series Fringe, and the series' 71st episode overall. The episode dealt with the Fringe team's investigation of a series of time loop fatalities.
