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It's Always Sunny in Philadelphia S5E10 — The D.E.N.N.I.S. System

9.3

It's Always Sunny in Philadelphia•Season 5•Episode 10

The D.E.N.N.I.S. System

9.3/10 · 5,798 votesNov 19, 200921 min

Ranked #1 of 12 in Season 5•+0.7 vs season avg

Discussion

Dennis reveals his foolproof system for seducing any woman to the rest of the gang, but they don't grasp the concept.

Directed byRandall Einhorn

Written byRob Rosell, David Hornsby, Scott Marder

Previous episodeE9 · Mac and Dennis Break Up Next episodeE11 · Mac and Charlie Write a Movie

Seasons18

All 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Season 5 Episodes12

E1 8.3

The Gang Exploits the Mortgage Crisis

E2 9.1

The Gang Hits the Road

E3 8.0

The Great Recession

E4 8.7

The Gang Gives Frank an Intervention

E5 8.8

The Waitress Is Getting Married

E6 8.3

The World Series Defense

E7 8.5

The Gang Wrestles for the Troops

E8 8.9

Paddy's Pub: Home of the Original Kitten Mittens

E9 8.5

Mac and Dennis Break Up

E10 9.3Now viewing

The D.E.N.N.I.S. System

E11 8.0

Mac and Charlie Write a Movie

E12 8.5

The Gang Reignites the Rivalry

Cast5

Charlie Day

Charlie Kelly

Glenn Howerton

Dennis Reynolds

Rob Mac

Ronald 'Mac' McDonald

Kaitlin Olson

Dee Reynolds

Danny DeVito

Frank Reynolds

Crew4

Randall Einhorn

Director

Rob Rosell

Writer

David Hornsby

Writer

Scott Marder

Writer

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Episode Summary

"The D.E.N.N.I.S. System" is episode 10 of It's Always Sunny in Philadelphia season 5. It scored 9.3/10 from 5,798 votes, ranking #1 of 12 episodes this season (season average 8.6). Directed by Randall Einhorn and written by Rob Rosell, David Hornsby, Scott Marder, it aired on November 19, 2009.

Next: E11 · Mac and Charlie Write a Movie Best of Season 5