Patrick Dempsey and Ellen Pompeo

Don't expect any crazed gunmen or rogue buses in the Grey's Anatomy finale. Instead, executive producer Shonda Rhimes tells TVGuide.com that she deliberately wanted to make the seventh season ender a less hectic and more character-driven experience.

First Look: Behind-the-scenes of the Grey's Anatomy musical episode

"I'm not looking to make some giant, huge, electric finale," Rhimes says. "You can't have a gunman in the hospital every season. It would just lose all its power. I wanted to do something that felt a little more quiet."

That's not to say that the finale won't be emotional for the doctors of Seattle Grace. As Rhimes told us before Season 7 began, the doctors would be challenged with more grown-up problems this year... and boy, have they. Following last season's tragic shooting rampage, Meredith (Ellen Pompeo) has been struggling to get pregnant, Cristina (Sandra Oh) battled PTSD, and Callie (Sara Ramirez) found out she got pregnant with Mark's baby while Arizona (Jessica Capshaw) was working in Africa.

And then there's the shocking conclusion to Thursday night's episode, in which Callie was seconds away from flying through Arizona's windshield. It's the catalyst for next week's big music event that Rhimes says they won't try to top in the finale.

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"Part of what we wanted to do at the end of the season is to really focus on the characters and to split our characters off in really new ways as we head to the end of the season, but not have it be an outside force that hasn't already happened," she says. "It's really about their growth as characters this year and who our characters are as people."

Still, that doesn't mean Rhimes hasn't got a few tricks up her sleeve for the final few episodes, which we hear include some life-changing moments.

The Grey's Anatomy music event airs Thursday at 9/8c on ABC.