Chuck bumps into his old flame Jill from Stanford while out on a Nerd Herd call. While they reacquaint themselves, Chuck lies by saying how successful he has been. But a flash on her boss has Chuck seeing a scientist who developed a bio-weapon. So it's up to Chuck, Sarah and Casey to find out if she's involved. Back at Buy More, Big Mike almost chokes to death. Emmett, the company efficiency expert, makes it mandatory that all employees learn how to perform CPR from Captain Awesome.