A hike turns terrifying when a father and son are stalked by a mysterious creature, bone-chilling shrieks strike fear into residents of a Colombian town and US Navy pilots are stumped when their radar locks in on unidentified aircraft.

Blood is drawn when a paranormal investigator explores an abandoned hospital in Texas, a baby's innocent play beckons a powerful entity and a snake hunter gets more than he bargained for when he spots a snake-like object in the sky.