"Grey's Anatomy" finished its Fall run on Thursday, December 3 and is due to comeback with a crossover event on January 14. In somewhat an annual tradition, the medical drama is going to cross path with its spin-off "Private Practice" again in episode "Closer to the Edge".
When Lexie finds out that there is something wrong with Leven Rambin's Sloan Riley's pregnancy, Mark is forced to summon Addison to Seattle Grace to perform a surgery. With more doctors in the crowd, complications and tensions tend to rise, and they extend to "Private" episode where Mark ends up calling Addison back for more surgeries.
The question whether sparks will fly once again between Mark and Addison has been brewing. Creator Shonda Rhimes offered a tease, saying "They're both really grown up since they were together, and most of the animosity that they had is gone. Now they're friends, but they may end up falling back into their old patterns while they're together."