page_title: Invasion (Grey's Anatomy)
section_title: Production
hierarchical_section_title: Invasion (Grey's Anatomy) / Production
caption_attribution_description: Héctor Elizondo at the premiere for Earth
context_page_description: "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 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's father returning to the hospital to condemn her homosexuality, and Dr. Izzie Stevens putting her career into jeopardy after administering the wrong treatment to a patient.
  The episode was Heigl's last appearance before her five-episode hiatus to film a movie. It is set in a fictional hospital in Seattle, Washington. Héctor Elizondo returned as a guest star, while Jesse Williams, Sarah Drew, Robert Baker, and Nora Zehetner made their first appearances. "Invasion" received generally positive reviews, with critics praising Drew's, Jessica Capshaw's, Ellen Pompeo's, and Sandra Oh's performances.
context_section_description: The episode was written by Mark Wilding and directed by Tony Phelan. Jenny Barak edited the episode's music and Donald Lee Harris served as production designer. Eric Dane (Dr. Mark Sloan) was absent from the episode. Featured music included The Myrmidon's "Clap", Traildriver's "I Want You Now", and Greg Laswell's remake of "Your Ghost". "Invasion" was the last episode Heigl appeared in, before her five-episode hiatus to film the romantic comedy Life As We Know It.
  
  Wilding called the guest stars "a blast to work with". He deemed the theme of the episode "invasion", adding that all the character's lives were being invaded. In the episode, Stevens makes a mistake, following a disagreement with Percy. Wilding commented that Stevens was originally seeking friendship with Percy, because he reminded her of O'Malley. At the conclusion of the episode, Torres ultimately reunites with her father Carlos. Wilding offered his insight on this and the overall episode: 
  Shonda came up with the idea of Mr. Torres showing up with the family priest. I immediately said YES because anytime I can see Hector Elizondo on my TV screen, I'm all for it. In the scene where he's quoting the Bible at Callie, he really is afraid he's going to lose her. He's desperate, yanking out those index cards like her very life depends on it. It was Hector's idea to use the cards. He didn't think his character would know that stuff of the top of his head, which is how I originally wrote it. And he was right. And it worked beautifully. And that final scene when he and Callie are outside the hospital and he's asking her if she'll still get married, still have kids… I really, really liked that scene. And I really, really liked their whole story. All told, I thought the episode came out pretty well.
  — Mark Wilding, Grey Matter
caption: The idea of quoting bible verses came from Héctor Elizondo, who guest starred as Callie Torres' father.
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