Marion Ross to Guest Star on Grey's Anatomy

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Marion Ross will soon be popping up on Grey's Anatomy, according to TV Guide.

The 81-year-old actress, beloved for her role as the mom on Happy Days, and more recently seen as the mother of Brothers & Sisters' Nora Walker (Sally Field), Marion will not be crossing over, per se, but playing a new character altogether at Seattle Grace.

"Marion plays an older patient who has an amazing epic love story with another older patient in the hospital," says Grey's Anatomy creator Shonda Rhimes.

"She did beautiful, beautiful work and was delightful."

Marion Ross Pic

Marion Ross' take on her Grey's Anatomy appearance?

"Our two gurneys pass each other – and there is a man I had a romance with fifty years ago," tells Marion, who shares scenes with Sandra Oh's Cristina Yang.

"It was such a joy for me."

She appears May 13.

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

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Grey's Anatomy Quotes

Arizona: Oh my God! I mean, I understand why you're into her. She's hot. Wait, she likes you?
Nathan: What? I mean, I'm going to try not to be offended at that.
Arizona: No, no, no. It's just that Derek was--Derek was epic for her. They were the great love story. I mean, that girl's heart beat for Derek Shepherd. It just...it never occurred to me that she would ever be with anyone else. He was perfect. He was everything. That man turned her world. It...I spooked you. Don't be spooked.

Did you say it? 'I love you. I don't ever want to live without you. You changed my life.' Did you say it? Make a plan. Set a goal. Work toward it, but every now and then, look around; Drink it in 'cause this is it. It might all be gone tomorrow."

Meredith (closing voiceover)