Throughout its run, Grey's Anatomy has introduced a plethora of characters. Most have left, but some have recently returned as guest stars, like Addison Montgomery.

Over 19 seasons, Meredith Grey's love life was one of the central ... at the end of the first installment, Derek's wife, Addison Shepherd (Kate Walsh), arrives in Seattle and lets her know she's ...

when she and then-husband Derek Shepherd, played by Patrick Dempsey, became entangled in a love triangle with Meredith Grey. After a lot of ups and downs, Addison ultimately left Grey Sloan ...