It's Halloween today. The spirit of the occasion has taken over one and all. And it seems Shonda Rhimes the creator of "Grey's Anatomy" is also bitten by a Halloween bug. Or may we say a Zombie? She is turning evil in her creation of ABC "Grey's Anatomy" season 10, episode 7 as she brings to her fans a Halloween special "Thriller."

Warning: Spoilers Ahead!

The previews on the Internet and television tell us that "Thriller" is going to be all about Halloween. Fans of Grey's Anatomy have seen all kinds of patients, aggressive, dangerous, reckless and more. Now be ready for some spooky ones as the trailer suggests.

For the first time in the history of the long running show, we have spooky patients entering the Grey Sloan Memorial hospital. Could it be a zombie in the disguise of a patient? Or is it a werewolf entering the vicinity of the hospital threatening the lives of the patients and doctors alike?

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CREDIT: Youtube.com/ TVpromoDVR2

A "30 year old male mauling victim" patient enters the hospital who claims about a gay attacking him from nowhere. And that is when Leah suspects it to be a "zombie." After which comes an unrestrained patient with two bullet holes right above his heart who grabs Leah and bite her when she is trying to figure his heartbeat in ER

To add to our curiosity ABC has recently posted a spooky promo picture of Meredith Grey. The photo titled "Night-Mer on Elm Street" has Meredith all covered in blood with a wicked smile on her face. It seems like she is up to something evil. What do you think fans, is she also bitten by a zombie or a werewolf? The look on her face is not that of saving lives but like she is taking some this time.

Other than the Halloween Spook we will see Ben coming back and collaborating with Derek to work on a new surgical technique. And Richard gets Bailey annoyed for asking a second-year resident to do his next surgery.

Meredith hasn't invited Yang for the big bash and Yang is of course feeling the distress between them. So, adding to the drama of Grey's Anatomy season 10, episode 7 "Thriller" is an awkward moment between the twisted sisters Meredith and Yang.

The previews of Thursday, Oct. 31 episode of Grey's Anatomy seem promising. Also, the creator of the show Shonda Rhimes tweeted on Oct. 29 that Grey's Anatomy's Halloween special is one her favourite episodes ever. So, don't forget to tune in to it to feel the chills on Halloween night with the Halloween special episode "Thriller."

Happy Halloween!