Claire Underwood is someone to be feared, if the full trailer for the final season of “House of Cards” is to be believed. The upcoming final season of Netflix’s flagship original series will focus solely on Robin Wright’s character, as she settles into the Oval Office in the wake of her husband’s death, which is cause for great concern according to nearly everyone around her. All in all, the series’ final season looks as though it is headed to a fairly definitive end game.