Susan Ivanova (Babylon 5) "Who is this? Identify yourself" "Who am I? I am Susan Ivanova. Commander. Daughter of Andre and Sophie Ivanov. I am the right hand of vengeance and the boot that is going to kick your sorry ass all the way back to Earth, sweetheart. I am death incarnate, and the last living thing that you are ever going to see. God sent me."
Babylon 5 - Alfred Bester. The definition of how an actor shakes off a type-casting. When I see Walter Koenig now this ruthless villain is the role I remember not the babbling baby Bolshevik from that other show he was on.