Kai is sarcastic. Kai has an innocent, almost sweet face. And Kai was usurp all the witch power he possibly can to pretty much take over the world. GULP.

We're back in time here with Katherine Pierce. Remember when she was the show's top villain?

Isobel Flemming played a key, villainous role on Season 1 of The Vampire Diaries. She was Elena's biological mother and Alaric's wife.

He's gone through quite the evolution over the years. But Klaus started out as the baddest of them all.

Mikael Mikaelson is the father of Klaus, Elijah, Kol and Rebekah. He's the one man who Klaus fears.

Esther Mikaelson is one mother of a witch. She had it out for her own children!

Atticus Shane gave all college professors a bad name. He was a bit too focused on resurrecting his ex-wife.

Connor Jordan was vampire hunter. He had his sights set on some of our favorite characters.

Galen Vaughn was a member of The Five. He was all about hunting down vampires.

Qetsiyah was bat sh-t crazy! Fun, entertaining and fascinating. But totally nuts!

Dr. Wes Maxfield has a plan for all vampires: he wants to make them feed on their own. YIKES!

Enzo is making his feelings strongly felt. This is a scene from The Vampire Diaries episode, "The Devil Inside."