We saw the phone call Derek received at the end of Grey's Anatomy. But what happened in the 14 hours prior to that in L.A. that prompted Addison to call her ex-husband so urgently?

As expected, it involved the failing health of her brother Archer (Grant Show, below) and Addison's push for treatment of his brain condition. His seizures are bad, and getting worse.

After much cajoling of her stubborn brother, Addison and Naomi convince Archer he must take action. She knows just the man - and that sets the stage for the big crossover event.

Follow the link for a full recap of last night's Private Practice, "Acceptance" ...

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