Fierce.

Okay, I'm in geek mode right now.  It's no secret that I am a big sci-fi nut.  As a result, I'm glued to the TV on a Friday night!  I just got done with Terminator:  The Sarah Connor Chronicles and absolutely loving the character Shirley Manson (from the band Garbage) plays on the series.  She definitely plays the 'bad guy' with fabulous intensity!