Cassidy Freeman stars as Tess Mercer on Smallville.  While Lex Luthor is away, Tess is in control of his company and runs it aggressively.  We think Lois Lane put it best when she said, "Tess Mercer is a pit bull in Prada."

Tess Mercer Quotes

Tess: Fix the situation, Stuart. Or I'll have you terminated.
Stuart: Okay, By terminated, though, you mean fired, right? Right?

Lois: I just came to tell you that I'm not leaving the Daily Planet.
Tess: You were never leaving, Lois. I fired you.
Lois: Well, I'm not going to get into the whole "she said, she said" thing with you.

Smallville Quotes

Lois: You've got to be kidding me. Little Mermaid, I dated your prince for like a day.
Mera: It's understandable that you would seek a superior companion. I'm just surprised that powerful men would choose someone with lesser ability.
Lois: Listen squid lips, you don't know anything about me or Clark.

Chloe: The true test of believing is someone knowing their lies are there to protect you.
Chloe: It's not really trust if you have to ask people to explain themselves.