: Derek operates on Chief Webber's brain tumor in secret.
: Izzie and Cristina risk their careers to find the truth about a patient's death. Eps9Greys Anatomy - Season 1
: A "syphilis train" starts with Alex and spreads to Olivia and George. : Derek operates on Chief Webber's brain tumor in secret
As the shift ended, a heavy Seattle rain began to fall. Meredith and Derek stood near the hospital entrance, ready to head home together. Their conversation was light, filled with the easy intimacy of a couple falling in love. But the doors swung open, and a woman in a perfectly tailored coat walked in. She was striking, confident, and carried an air of authority that stopped them both cold. "Derek," she said, her voice steady. As the shift ended, a heavy Seattle rain began to fall
: Addison Montgomery-Shepherd arrives, revealing Derek is married.
Derek froze, his face draining of color. "Addison. What are you doing here?"
The season one finale of Grey's Anatomy , titled "Who's Zoomin' Who?," originally aired on May 22, 2005. The episode is famous for its massive cliffhanger: the arrival of Addison Montgomery, Derek’s secret wife.