Nancy Travis

Nancy Travis will appear in an upcoming episode of Grey's Anatomy, TVGuide.com has learned exclusively.

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Travis will play Allison, a patient in Derek's Alzheimer's clinical trial. Her 10-year-old son takes more care of her than the other way around, which will make Dr. Stark (Peter MacNicol) insist that Social Services be contacted.

Kate Walsh returning to Grey's Anatomy

The 49-year-old actress is best known for her film roles in So I Married an Axe Murderer and 3 Men and a Baby. More recently, Travis starred in The Bill Engvall Show and appeared on Desperate Housewives.