Dennis teaches the guys his comprehensive seduction system that will help them gain the undying love and devotion of any woman. However, Charlie struggles to utilize what he just learned, while Mac and Frank decide to go in their own direction. Meanwhile, Dee fears that her boyfriend might be using a similar system to play her.

Episode Viewers and Ratings

Season 5 Episode 10 of It's Always Sunny in Philadelphia resulted in a 0.00 rating in the 18-49 demographic.

It's Always Sunny in Philadelphia Season 5 Episodes...

• s05e01 - The Gang Exploits the Mortgage Crisis
• s05e02 - The Gang Hits the Road
• s05e03 - The Great Recession
• s05e04 - The Gang Gives Frank an Intervention
• s05e05 - The Waitress is Getting Married
• s05e06 - The World Series Defense
• s05e07 - The Gang Wrestles for the Troops
• s05e08 - Paddy's Pub: Home of the Original Kitten
• s05e09 - Mac and Dennis Break Up
• s05e10 - The D.E.N.N.I.S. System
• s05e11 - Mac and Charlie Write a Movie
• s05e12 - The Gang Reignites the Rivalry

It's Always Sunny in Philadelphia Show Summary

Five egocentric friends who run a neighborhood Irish pub in Philadelphia try to find their way through the adult world of work and relationships.

Unfortunately, their warped views and precarious judgments often lead them to trouble, creating a myriad of uncomfortable situations that usually only get worse before they get better.