Grey's Anatomy's Halloween episode, Haunt You Everyday, airing October 25, is going to be freaking HUGE. I'm not even joking. Take a look at the plot that ABC released here and the gallery here, and you'll only see a portion of what I'm talking about. To see the other portion? Read on to see what Michael Ausiello had to say:

I thought I’d give you the chance to turn things around and share some Grey's scoop with us.
Dr. Hahn will be returning for the Halloween episode on Oct. 25, and she’ll make a controversial decision that causes a major rift between Cristina and Izzie. Also, the fallout from Gizziegate will throw Callie and Cristina together in a very unexpected way, and someone is fired from his/her position.
Can you give us the scoop on this new actress cast on Grey's Anatomy? Is she Derek's sister or a potential new love interest?

Promise you won't shoot the messenger? I mean it — promise. OK, she's Derek's potential new love interest. Hey, you promised!
More Grey's please!

Someone from Mer's past is returning next month — and this person's identity is revealed in my latest vodcast! (It's Thatcher, Meredith's father.)

So, who's getting fired? Could it be Callie? What rift will Dr. Hahn cause? And will the new actress and McDreamy really get it on? Could the new season get any better?!