Private Practice has already moved to the same night as its "parent" series, Grey's Anatomy. But a week from Thursday, February 5, will mark an unprecedented development for both as two of TV's top dramas join forces in a much-anticipated crossover event.

Grey's Anatomy is off next week, while Private Practice is airing a new episode, entitled "Second Chances." Then on February 5, Addison seeks Derek's help to treat her brother, Archer, as the preview for the next new Grey's, "Beat Your Heart Out," shows.

Also, could Derek be popping the question?! Just 13 more days ...

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Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.