Season 1 introduces MerDer quickly ... just to rub salt into the wound and upset her on purpose. In Season 11, Derek Shepherd's brain-mapping research catches the President's eye, and he's ...

Kate Walsh played Derek Shepherd's ex-wife ... reunion during the season 17 premiere of the ABC drama. Last week, fans were in for quite the surprise when Meredith collapsed in the hospital ...

Ellen Pompeo and Patrick Dempsey costarred as Meredith Grey and Derek Shepherd on Grey’s Anatomy ... "Song Beneath the Song," during season 7. "Remember we did that horrible musical number ...