Richard Cartwright/ABC
Adam B. Vary
December 02, 2011 AT 12:00 PM EST

Just in time for February sweeps, Grey’s Anatomy will travel to a parallel universe in which Derek (Patrick Dempsey) and Addison (Kate Walsh) never broke up.

The “What If?” episode takes off after Meredith (Ellen Pompeo) wonders what would have been different in her life if her mother (Kate Burton) had never been afflicted with Alzheimer’s. With that kind of game changing detail, you can imagine other Grey’s favorites may be making their way back to Seattle Grace, although Walsh will be the only former member of the main cast to reappear.

Read more:

EW’s ‘Grey’s Anatomy’ recaps

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