5. Adam Knight (Ian Somerhalder)
There was always something amiss about Adam, whether it was the fact he was the creepy guy living above the coffee shop, or simply actor Ian Somerhalder’s ability to pull a scary face. During his season three appearance, despite the character’s lack of chemistry with Lana, I found him to be one of the recurring elements of Smallville that was working really well – a genuinely menacing character.