"Chuck Versus the Ex" is the sixth episode of the second season of American television series Chuck. It originally aired on November 10, 2008. Chuck Bartowski runs into his ex-girlfriend Jill Roberts (Jordana Brewster) while on a Nerd Herd call. In an attempt to save face, he lies to the girl who broke his heart and tells her that he is more successful than he really is. When Chuck flashes on Jill's boss, a research scientist who may have developed a deadly bio-weapon, he, Sarah Walker, and John Casey must find out if Jill is involved. Meanwhile, at the Buy More, Big Mike nearly chokes to death, which leads company efficiency expert Emmett Milbarge (Tony Hale) to implement a mandatory CPR course taught by Devon Woodcomb.