Arguably the best part of House of Cards, Robin Wright's beautiful performance of Claire Underwood has naturally garnered her numerous nominations and awards. Yet it's the show's final season where she is given a real chance to shine and we witness how far Claire is really willing to go.
In the beginning of the sixth season, Claire receives a barrage of gross and sexist attacks on her life. As commander in chief, and the first female one at that, the country does not like her. She spends much of the season grabbing onto any chance she can get to make Americans fearful. She tries to control the populace and her nemeses — The Shepherd Corporation, helmed by brother and sister Bill and Annette — through manipulation and backstabbing. She spends much of the season under their thumbs, as they blackmail her with the knowledge that she's behind Tom's death. With that threat looming over her, she has to find ways to get out from under their control.
Through numerous political maneuvers, some successful (like firing her whole Cabinet and replacing them with women) and some less so (the murder of various characters), her presidency manages to stay alive throughout the season, thanks in no small part to the fact that she is also pregnant with Frank's baby (yes, really).
As her belly grows, so do her vicious schemes. The last we see of Claire, she is in the Oval Office with Doug. He threatens her with a letter opener, but she turns it on him, first stabbing him in the gut, then smothering him.