Smallville, Season 4

Clark:
Where's Lex?

Alexander:
He's standing right in front of you.

Clark:
No, you're not him. The real Lex would never try to kill me or Chloe.

Alexander:
No, you're probably right. But he's thought about it! All the times you've meddled in his plans, derailed his ambitions. He's thought about killing all of you. He just never had the guts to go through with it.

Clark:
What are you?

Alexander:
I was just about to ask you the same question.