Amber Philips as Cassidy Montgomery "Why are you here derek. Go back to Addie"
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Patrick Dempsey as Derek shepherd "I came for you cass. I want you"
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Kate Walsh as addison Montgomery "My sister and my husband? And you judged me for mark?"
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The rest of the greys anatomy cast as themselves; Ellen pompeo as Meredith grey Justin chambers as Alex karev Sandra oh as Cristina yang Katherine heigl as izzie stevens T. R knight as George O'Malley Chandra Wilson as Miranda Bailey Kate Walsh as Addison Montgomery Eric Dane as mark Sloan
*** I own Cassie Montgomery and her storyline and any children she has. Everything else belongs to the producers of greys anatomy; shonda rhimes and Krista vernoff
