'Grey's Anatomy': Derek, Addison back together in 'What If' episode | EW.com

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'Grey's Anatomy' scoop: 'What If' episode reunites Derek and Addison

Greys Anatomy Walsh Demp

(Richard Cartwright/ABC)

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.

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