From terrifying encounters and incredible feats to gang warfare and alien invasions, each episode of "Shark Attack Files" is a wall-to-wall invasion. Footage from actual attacks, shark interactions or bizarre behavior, both professional and user-generated, kicks off each mystery. Investigations attempt to go beyond the headlines by following new attacks and footage. While digging deeper, even more is uncovered, and what starts as one mystery can become multiple events that lead to a single revelation.