Are you evil? And if so, how evil? Discovery Channel's Curiosity series tapped horror movie writer-director and actor Eli Roth -- yes, the man behind the decidedly evil 'Hostel' franchise -- to find out in their new special, titled 'How Evil Are You?' (premieres Sun., Oct. 30, 9PM ET on Discovery).

Recreating Yale professor Stanley Milgram's groundbreaking and disturbing psychological experiment from the 1960s -- which showed regular people inflicting pain on others because they were "just following orders" -- Roth came away with some fascinating insight into human nature, and a very matter-of-fact conclusion. "We haven't changed in 50 years, and I don't think we will," he said.

Here, Roth talks more about the nature of evil and why even Hitler shouldn't be completely faulted for his evil acts during the Holocaust. And speaking of Hitler, as the guy that killed Hitler (on-screen in 'Inglourious Basterds,' that is) does Roth think he has what some have dubbed "the evil gene"? He goes through a few tests himself in the special, all in the name of science and his own curiosity.

Keep reading for more on this fascinating study, and to find out which recent horror movie sequel "terrified" the master, leaving Roth and pal Marilyn Manson "squealing like teenage girls." (You're welcome.)

This Discovery star is unrecognizable, isn't he? It is a he, right? Honestly, the make-up job is so good, nothing would surprise me.

These unbelievable exclusive photos popped into my inbox and my jaw dropped -- one of Discovery Channel's most beloved stars has aged rapidly for their latest 'Curiosity' special titled 'Can You Live Forever?'



Curious? Find out who it is and why they did this after the jump, plus enter to win an equally amazing prize.