Grey's Anatomy and Private Practice return tomorrow night on ABC, and from the sneak previews and extended promo we've seen, there's little doubt Mark and Addison, well ...

Let's just say that it looks like old habits die hard for these two in the Grey's Anatomy-Private Practice crossover event. You're either going to love it or be kind of creeped out.

While much of the focus on the Mark-Addison relations has centered on what that means for Mark and Lexie, has anyone thought to consider how it might impact Sam Bennett?

According to TV Guide, Sam's "jealousy will turn to regret, as he kicks himself for turning down Addison's previous overture." Wow. Maybe they're not ready to be just friends!

You missed your chance, Sam!

The Grey's rumor mill is also active with reports of Callie being sick. Eeek!

For the record: Callie is not dying. She just has chicken pox and will be nursed quickly back to health ... by Arizona! Not the hot Calzona action we hoped for, but still cute!

Elsewhere on the health front, though, the news is not so open-and-shut. A rumor that Owen's terrible post-traumatic stress disorder will flare up again is no laughing matter.

"We haven't seen much of it yet, but that doesn't go away," Kevin McKidd says. "My hope is we see him be able to deal with it in a more self-sufficient, non-destructive way."

He adds: "I think Teddy coming back churns up a lot of that stuff."

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