Leslie decides to wage war on obesity in Pawnee in her first mission as city councilor by passing a city-wide soda tax. Meanwhile, Andy tries to get in shape for his police-entrance exam, and Ben struggles to connect with the interns in his office.

Ben and Leslie's rival bachelor and bachelorette parties each take on a very different tune.

Leslie celebrates her first year as a city councilwoman. Retired Special Agent Burt Macklin is recalled to action. April gets some life-changing news. Tom debates a big business opportunity.

Leslie wins an award from an international Women in Government organization, and travels to London with Ben, Andy, April and Ron to accept it.

On Ann and Chris's last night in Pawnee, Leslie throws a grand farewell party and attempts to fulfill one last promise. Meanwhile, Tom, Ben, Ron and Andy struggle to find the perfect going away gift for Chris.