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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.
Grace Adler Grace has a string of boyfriends throughout the series, many played by guest stars such as Woody Harrelson and Gregory Hines. Grace marries the Jewish doctor Leo Markus, played by Harry Connick, Jr., on November 21, 2002, but the marriage ends when he has a one-night stand with a doctor from the Red Cross while working in Cambodia with Doctors Without Borders. In season 8, the two reunite briefly during a flight to London when they coincidentally met on the plane. Their mile high tryst leads to Grace getting pregnant, but she doesn't tell Leo because he is engaged to another woman. However, in the series finale, she and Leo remarry and raise the baby, a girl named Laila, together. Laila is born in Rome, where Leo is working at a hospital as a researcher. After one year in Rome the family moves back to New York, to their apartment in Brooklyn. Laila goes on to attend college and there meets Will and Vince's son, Ben. Laila and Ben are living in dorm rooms opposite each other's while at college; the same scenario that Will and Grace found themselves in while they attended college. Ben and Laila marry soon afterward.[14]