The Fat Guy Strangler

"The Fat Guy Strangler" is the seventeenth episode of the fourth season of, and the 67th episode overall. It first aired on November 27, 2005.

Synopsis
"When Lois drags Peter to the doctor for a physical, his prognosis is clear: he's too fat. This news drives Peter to form the NAAFP, an advocacy group for the advancement of fat people. Meanwhile, Lois discovers her long-lost brother, Patrick, and fights to get him released from an insane asylum. But a string of fat guys go missing soon after, and Peter and the NAAFP ban together to get to the bottom of it."

- The Futon Critic