Where We Left Off: Leslie Knope began a secret relationship with Ben Wyatt, one that may deter her budding political career. Tom Haverford left the parks department to form a media company with Jean-Ralphio and Ron Swanson's first ex-wife, Tammy 1, showed up in his office.

What's Next: Patricia Clarkson will guest star for several episodes as Tammy 1, Paula Pell will play Ron's mom, also named Tammy, and Ron's facial hair will get a storyline of its own. Finally.

Season 4 premieres Thurs., Sept. 22, 8:30PM ET on NBC