when did mercy west merge with seattle grace
Invasion (Grey's Anatomy) "Invasion" is the fifth episode of the 6th season of the American television medical drama Grey's Anatomy, and the show's 107th episode overall. It was written by Mark Wilding and directed by Tony Phelan. The episode was originally broadcast on the American Broadcasting Company (ABC) in the United States on October 15, 2009. In the episode, the physicians of Seattle Grace Hospital must learn to co-operate with new Mercy West residents, who do not act in a kind manner to them. Other storylines include Dr. Callie Torres (Sara Ramirez)'s father returning to the hospital to condemn her homosexuality, and Dr. Izzie Stevens (Katherine Heigl) putting her career into jeopardy after administering the wrong treatment to a patient.
Invasion (Grey's Anatomy) Under the supervision of Dr. Derek Shepherd (Patrick Dempsey), Lexie works with Mercy West resident Dr. April Kepner (Sarah Drew) on a burglar, and the two get in several disagreements, leading Lexie to steal her diary. Dr. Alex Karev (Justin Chambers) and Adamson continuously argue over the course of treatment for a patient, leading the patient's daughter to yell at them in disbelief. Angry about the revelation that Percy (who later apologized saying that they can be friends outside the hospital, but not inside) was using her, Stevens accidentally administers the wrong dialysis to a patient, making her an unviable candidate for the kidney transplant she was scheduled to receive. After arguing over surgical cases for the entirety of the day, Yang comes to the realization that she needs a cardiothoracic surgeon to work at the hospital. After being mistreated by Kepner, Lexie begins to mock her about what is written in her diary, thus ruining her emotionally, but subsequently apologizes. Dr. Arizona Robbins (Jessica Capshaw), Torres' girlfriend, talks to Carlos, and convinces him to accept his daughter's sexuality. Having found out about Stevens' mistake, Dr. Miranda Bailey (Chandra Wilson) reprimands her reports her to the chief of surgery Dr. Richard Webber (James Pickens, Jr.). Webber asks Stevens to come into her office, and he fires her from the staff, noting that Hunt, Shepherd, and Karev had concerns with her coming back to work so early. Stevens departs, writing Karev a Dear John letter, causing him to cry in front of Meredith and Yang.