By EW Staff
Updated April 22, 2010 at 09:48 PM EDT

Image Credit: Kevin Parry/WireImageRon Swanson better watch his back.

Megan Mullally is set to reprise her role as Ron’s (Nick Offerman) manipulative ex-wife Tammy on Parks and Recreation in an episode to air early next season.

“I’m doing one next week or the week after,” the Emmy winner told us following last night’s Paley Center panel for Starz’ Party Down, which she joins in its second season.

Mullally, who is the real-life wife of Offerman, was tight-lipped about what’s in store for the onscreen duo, but she did tease that there’s “going to be more fireworks… What I’ve heard so far is extremely high stakes.”

As previously reported, Mullally’s Party Down costar Adam Scott is joining Parks and Recreation in a regular role later this season.

“Rob Lowe and I come in as state auditors because they’re having a financial crisis in Pawnee,” Scott said. “We’re not exactly welcome in the department.”

Although Scott is reported to be a love interest for Amy Poehler’s Leslie Knope, both he and Mullally are hoping that they’ll get to share some scenes on the NBC comedy. Suggests Scott: “Maybe the librarian and the state auditor will hook up.” (Vlada Gelman)

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