Adam Scott joined the Parks and Recreation cast as Ben at the end of season two.  Ben is a state auditor that was sent in to Pawnee to help make budget cuts.  He's the bad cop to Rob Lowe's Chris.

Ben Wyatt Quotes

And what exactly does Gryzzl do? It’s a cloud for your cloud. I have no idea.

Ben

Andy: From now on, we will be using code names. You can address me as
Eagle One. Ann, code name -- Been There, Don That. April is --
Currently Doing That. Donna is -- It Happened Once in a Dream; Chris,
code name -- If I Had To Pick a Dude. Ben is -- Eagle Two.
Ben: Oh thank God.