This week's episode of Grey's Anatomy, "Invasion," looks like it has been aptly named.

New residents from Mercy West are swarming in on the new iteration of Seattle Grace and vying for jobs. Dr. Izzie Stevens is in for a tough fight, from the looks of the pictures below.

Katherine Heigl's character, who we know is taking a five-episode hiatus this year, can be seen in these images getting in the face of the newcomers and the face of her boss, Richard.

This episode may very well mark her sendoff, but for what reason? Stay tuned there.

Meanwhile, Callie's dad (guest star Hector Elizondo) is back in Seattle, looking to bring his daughter back to heterosexuality. That's not going to work, and should be quite awkward.

Click to enlarge the images from this week's episode of Grey's Anatomy ...

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