The Vampire Diaries 100th episode is upon us and tonight they will celebrate with "500 Years of Solitude". However, that is just the end of one chapter and the beginner of another for season 5. Coming up in episode 17, fans will meet a new big bad, Markos. He is described as 'super dark' and from a 'far away land.' Markos is an imposing leader with plenty of charisma to ensure his followers' worship and loyalty.