Grey's Anatomy season 11, episode 8 titled Risk airs tonight, 20 November, and looks like the highlight of the midseason finale episode will be Meredith and Maggie versus Derek.

Derek and Meredith's relationship is already going through a rough patch and with the upcoming episode's official synopsis suggesting a "bigger argument between the couple", it remains to be seen how matters unfold for the two central characters.

According to the official synopsis of the midseason finale episode, "Maggie and Meredith disagree with Derek about the best way to approach a patient's case, which leads to a bigger argument between the couple. Meanwhile, Callie feels responsible when one of her veterans is pushed too far and one doctor's routine procedure results in a devastating diagnosis, on the winter finale of Grey's Anatomy."

The promo video for the upcoming episode shows that April is having a pre-natal sonogram with the help of Stephanie, her husband's former lover. Stephanie accidentally reveals the baby's gender, but also finds alarming information about April and Jackson's baby, reports Christian Today.

It's unclear as to what exactly Stephanie discovered but she and Arizona definitely appear concerned.

"I think something's wrong with Jackson and April's baby," Stephanie says in the promo. "I haven't told her. I haven't told Jackson. I have no idea what to do."

Meanwhile, Callie's career might be in jeopardy after she blames herself for pushing one of the hospital's veteran patients too far by forcing her to walk.

The midseason finale of Grey's Anatomy season 11- episode 8 will air on Thursday 20 November at 8:00 pm ET on ABC.

Click here to watch the episode online via live stream.

The show will return on 29 January 2015 post its midseason break.