The traumatized doctors of Seattle Grace Mercy West will be trying their hardest to get back to normal when Grey's Anatomy returns for its seventh season next month, but reminders of the murderous tragedy they collectively witnessed will be everywhere.

Specifically, Mandy Moore.

The singer and actress, who played a memorable role as a patient in May's two-part season finale, will be returning to the show in the sixth episode of the new season.

From MerDer time bombs to a shaken-up Cristina and a couple we know getting married, the new season will clearly be influenced by the last. How does Mandy fit in?

Mandy Moore will return to Grey's this fall. [Photo: ABC]

Mandy's character, Mary, was the unfortunate patient coping with a colostomy bag when called upon to assist Bailey in her ultimately unsuccessful, desperate struggle to save the life of gunned-down Mercy West transplant Charles Percy (Robert Baker).

No word yet if Mary's cute hubby Bill (Cougar Town star Ryan Devlin) will be returning as well, but we're interested to see what her new guest stint means for the doctors - Bailey in particular. Will it just bring back haunting memories of that fateful day?

Are you excited to see Moore return to Grey's Anatomy? Discuss below.

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