Below is a photo gallery from this week's episode of Grey's Anatomy, "Invasion." It looks like a pretty intense episode, with the new residents merging with Seattle Grace's finest.

It also appears as if Dr. Izzie Stevens may be in for a really rough go of it, from the looks of a couple of the pictures below. She's feuding with those newbies and with the Chief.

Meanwhile, Callie's dad is back, and he looks far from pleased. Guy still thinks he can "turn" her. This won't end well. Click to enlarge the images below and see what you think ...

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