[s4e2] | Love/addiction

The episode explores various forms of "addiction"—from chemical dependency to toxic emotional attachments—as the staff at Seattle Grace Hospital treats victims of a massive apartment explosion. Main Plotlines

Meredith and Derek continue their "friends with benefits" arrangement, which Derek eventually admits feels more like an addiction than a healthy relationship. [S4E2] Love/Addiction

Watch a recap of the episode's themes and major character developments here: attempts to bond with Meredith

Meredith's half-sister, Lexie, attempts to bond with Meredith, who remains resistant to having a relationship with her. [S4E2] Love/Addiction

The residents and interns treat victims of a massive apartment fire caused by a meth lab explosion. Alex Karev deals with a particularly difficult case involving a baby who suffered a stroke due to the meth lab environment.