Seth tags along with Ryan who travels to Enseniada, Mexico to look for the fugitive Volchok, and tries to hold off Ryan from doing something drastic. Back in Newport, there is a clothing drive at Harbor High, where Julie persuades Kaitlin to participate in it, until she learns Kaitlin's true agenda. At Brown University, Taylor pays Summer a surprise visit, but does not want to confide in her about her problems of her own back in France.
The working title for the film was "Biohazard".