Explore the world’s most fascinating, strange and inexplicable mysteries. Each episode features compelling contributions from scientists, historians, witnesses and experiencers—each seeking to shed light on how the seemingly impossible actually can happen.

A look at the hunt for California's Zodiac Killer, who murdered at least five people in the San Francisco Bay Area in the late 1960s and early '70s.

Unforgettable cases, featuring dedicated homicide detectives and forensic scientists to hunt down the perpetrators. Crime Stoppers is an 8-time Emmy award-winning program that exposes horrifying, unsolved homicide and kidnapping cases across the United States. The crime stories go behind the headlines to reveal compelling insights with reenactments, narrated by the detectives and victims' families to and involve the viewer to ensure justice is served.