When the Mercy West doctors descended on Seattle Grace in last week's "Invasion," there was no love lost between our old standbys and their job-hungry competitors.

What we saw then paled in comparison to this evening, though.

In a chaotic ER scene, disaster strikes and there is plenty of blame to go around, compounding the already-rising tension in a turbulent environment. At times, it got ugly.

The truth came out eventually, and someone dearly paid the price.

Did you see that turn of events coming, or were you surprised?

What did you think of tonight's Grey's Anatomy in general?

Our recap of "I Saw What I Saw" will be posted soon. In the meantime, tell us how you felt about the episode by commenting and voting in the Insider survey below.

As always, the Grey's Anatomy Insider staff will post quotes, music, news, photos, spoilers and all things Grey's Anatomy as soon as possible! Thanks for visiting us!

"I Saw What I Saw" was ...

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.