The biggest mystery of all in respect to the serial killer is "why?" Featuring: The Night Stalker and Jeffry Dahmer

Featuring: The Green River Killer and BTK

One of the defining traits of serial killers - sociopathic behavior. This episode looks at the Gainesville Ripper, the Unabomber, and other serial killers operating in the 1980s.

The sensationalist nature of the Hillside Strangers and Beltway Snipers cases helps to further solidify the serial killer's unofficial home in popular culture and on the nightly news.

Some serial killers kill out of desire. But it's thought that some kill out of a rejection of their own desire - which is explored through a look at John Wayne Gacy and the Highway Killers.

Featuring The Zodiac, the Son of Sam, Charles Manson and Ted Bundy

The 1960s and 70s represented the dawn of a new era in serial killing. Featuring: The Boston Strangler, Ed Gein and the Lipstick Killer

A look into the demented sadistic masochistic Albert Fish (The Vampire of Brooklyn), child killer and cannibal.

This is the 1800s and talks of H. H. Holmes (Doctor Death), and Jane Toppan (The Angel of Death).

Episode One discusses 'The Monster Within And Among Us', and discusses Jack The Ripper (even though he's not American), since he is pretty much the first recognized serial killer. Since a lack of real footage is obvious, this episode uses footage from an old black and white move, loosely based on Jack The Ripper.