The second season dates back to a strong and different event. Peter Faragot, Sarah Jordan and Dr. Kyle Sommer go to a mysterious island to investigate the causes of unknown diseases that have killed everyone, except Leila, on the Avalon fog. On the other hand, a sick child appears as the team investigates the island, but Sarah suspects something is wrong when the child miraculously recovers; Julia and Caleb discover the mystery of the island when Alan's tomb is being dug.
