Grey's Anatomy Season 10 wraps up with its finale episode on Thursday, May 15 with a chilling and unexpected turn of events.

In previous spoilers, it has been determined that Cristina Yang is leaving Grey Sloan Memorial Hospital to pursue a different path in Europe. But creator Shonda Rhimes might be thinking of another way for Yang to depart, and the most recent spoilers are claiming that resident surgeons are faced an emergency situation - terrorism.

Episode 24 Fear (of the Unknown) lives up to its name as Cristina, Meredith, and April's futures are still unknown.

April is pregnant and she has got to find a way to make ends meet with her professional commitment to the hospital.

Sandra Oh's character has not yet bid farewell to the group, and from the looks of it, fate must be stalling her from leaving.

Meredith, on the other hand, is faced with the biggest decision of her life about whether or not to accept a position in Washington.

According to spoilers, news breaks out on the episode that Seattle could be under a terrorist attack, and thousands fatalities are predicted if things turn out bad.

Rumor has it that Rhimes is planning a different kind of exit for Cristina or Meredith, if she decides to leave Seattle. In one scene, Cristina is being rushed to the ER, while Meredith is seen teary eyed.

Spectators are wondering if there will be a big casualty list within the group of resident surgeons. If yes, then it would be the most fatal and devastating season finale for Grey's Anatomy ever.

Grey's Anatomy Episode 24 The Finale airs on May 15, 9 p.m. EST on ABC.