While the interns gossiped about the outbreak, Izzie and Cristina were caught in their own ethical storm. They performed an unauthorized autopsy on a patient to prove his death wasn't their fault, eventually discovering a genetic condition that saved the man's daughter. Meanwhile, Derek was busy performing a secret surgery on Chief Webber, who was struggling with a brain tumor that threatened his eyesight.
: Derek operates on Chief Webber's brain tumor in secret. Eps9Greys Anatomy - Season 1
Derek froze, his face draining of color. "Addison. What are you doing here?" While the interns gossiped about the outbreak, Izzie
Meredith Grey spent the day feeling like her relationship with Derek Shepherd was finally on solid ground. They had survived the initial awkwardness of their secret romance and the pressures of the internship. But at Seattle Grace Hospital, peace was always temporary. A syphilis outbreak had swept through the staff, forcing the Chief to hold a mandatory—and humiliating—meeting about sexual health. George O’Malley was the most public victim of the "syphilis train," having contracted it from Olivia, the nurse who had caught it from Alex Karev. : Derek operates on Chief Webber's brain tumor in secret
: Addison Montgomery-Shepherd arrives, revealing Derek is married.
The woman turned her gaze to Meredith, her eyes sharp. "And you must be the woman who's been sleeping with my husband."