"Invasion."

It's an ominous title for an episode, but it appears apt. Tonight, Seattle Grace and Mercy West merge and the landscape of Grey's Anatomy as we know it will be altered. Forever.

As evidenced by the previews, pictures and Grey's Anatomy spoilers we've posted this week, the tension is rising, the stakes are high, and the battle lines are clearly drawn.

All we can do is sit back, watch, and hope.

Is Izzie really going to get fired? If not her, who will? Will any new residents be a pleasant surprise? What else do you think and hope will happen on tonight's Grey's Anatomy?

Discuss tonight's Grey's Anatomy by leaving comments below and chatting with fellow fans in our

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