Ron Swanson made his first appearance in the pilot episode of Parks and Recreation, where he repeatedly denies Leslie's requests to pursue turning a construction pit into a park because he does not believe the parks department should build parks at all.
Ron's second ex-wife, Pawnee library director Tammy (Megan Mullally), appeared in the episode "Ron and Tammy," where Tammy tricks Leslie into arranging a reunion meeting with Ron under the guise of wishing to work out her differences with him.