When a severe flu outbreak sweeps through Philadelphia, claiming the life of an elderly neighbor, the gang worries that the rampant bug could adversely affect their voices. With a singing competition - the winner of which will open for Boyz II Men - on the horizon, the gang chooses to voluntarily quarantine themselves inside of Paddy's in an attempt to keep their singing voices pristine. While a solid plan in concept, the execution of their quarantine leaves much to be desired, as no sooner do they begin their self-imposed isolation than they begin breaking all the strict rules they've set for themselves. Meanwhile, Frank, fearing that his age could make him even more susceptible to the flu virus, takes his desire to remain germ-free to a new level of crazy.

It's Always Sunny in Philadelphia Season 9 Episodes...

• s09e01 - The Gang Broke Dee
• s09e02 - Gun Fever Too: Still Hot
• s09e03 - The Gang Tries Desperately to Win an Award
• s09e04 - Mac and Dennis Buy a Timeshare
• s09e05 - Mac Day
• s09e06 - The Gang Saves the Day
• s09e07 - The Gang Gets Quarantined
• s09e08 - Flowers for Charlie
• s09e09 - The Gang Makes Lethal Weapon 6
• s09e10 - The Gang Squashes Their Beefs

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.