Watch out, Grey's Anatomy fans — Calzona is about to blow!

In a new sneak peek, viewable below, Owen (Kevin McKidd) arranges an emergency meeting of the available members of the board — Meredith (Ellen Pompeo), Derek (Patrick Dempsey), Cristina (Sandra Oh), Callie (Sara Ramirez), and Arizona (Jessica Capshaw) — in Mer's hospital room.

Oh, and Bailey (Chandra Wilson) is there, too, claiming that she has "Bailey business" with Mer's newborn son — whose name is not actually Bailey, by the way.

Owen tells the gang that Jackson (Jesse Williams) is absent because he's recovering from a dislocated shoulder, an injury he sustained while rescuing people from the bus crash.

"What bus crash?" asks a confused Meredith.

"She had a baby. She doesn't know things," Cristina explains.

Owen says that the good news is that all the passengers survived with minor injuries but that the bad news is "everything else" — the blood bank is flooded, the ER is a mess, they're dangerously low on meds, and staff members can't make it to the hospital because of the flooding.

Meredith proposes to help contact suppliers. "I had a baby. I'm not dead," she says.

Jackson finally arrives and says that the airport is open, so he put Dr. Boswell in a cab.

"Who's Dr. Boswell?" Cristina asks as Arizona stares pointedly at the ceiling.

Callie, who'd been glowering in the corner the whole time, finally chimes in: "She's the woman Arizona slept with last night."

And boom goes the dynamite. We're sure it's the first of many emotional explosions of the two-hour Season 10 premiere, airing Sept. 26 at 9 p.m. ET on ABC.

Will Callie ever forgive Arizona? Give your prognosis for this fractured relationship below.


Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!