Note: Clips of 'Ghosts of Beirut' are courtesy Showtime. Audio of Lebanon at war is from the Associated Press archive.

As Lebanon sank into the abyss in the 1980s, few people noticed a teenager who had worked as a bodyguard for Yasser Arafat's PLO. But his deeds would soon start making international headlines. Long before Osama bin Laden became a household name, this unknown young man began a decades-long crusade of bombings, kidnappings, and assassinations that would leave hundreds of people dead in dozens of attacks across the globe. Few knew what he looked like or his actual name. Known as "the ghost," Imad Mughniyeh was a founding member of Hezbollah in Lebanon. Mughniyeh remains a mysterious figure, but he made an enduring impact on history. His rise and fall are the focus of the new Showtime dramatic series “Ghosts of Beirut.” In this episode, director Greg Barker discusses why he made a film about the terrorist whose mark on global events far surpassed his notoriety, a shadowy figure whom the CIA and Mossad hunted for a quarter-century.