In the two-hour series finale Friday (8/7c, NBC), however, Sarah (Strahovski) threatens to break that heart after disastrous events in the last episode. In an attempt to save Chuck's (Levi) life, she had downloaded the faulty Intersect, which rapidly caused her memories to deteriorate. "Before we're able to get it out of her head, the damage is done," Levi explained. "She's kidnapped by Quinn and kind of reprogrammed." Her new orders? Kill Chuck Bartowski.