When a severe flu outbreak sweeps Philadelphia the gang voluntarily quarantine themselves inside of Paddy's.
After one of Frank and Charlies neighbors die from a flu, the gang decides to lock themselves up in the bar and become quarantined. While being quarantined, the gang doesn't follow the rules and all get locked up by Frank, who at the same time is losing his mind, and Charlie just thinking that Quarantine is a game.—James Hake