When a trendy new hair salon opens up right next door to Paddy’s, Dennis and Frank go on the offensive to stop women from cutting off their hair. Meanwhile, Mac is reunited with his childhood dog Poppins.
As a record-breaking heat wave overtakes Philly, the Gang plans to profit from global warming by pumping up the A/C so people will congregate at Paddy’s and save energy at home.
In the black-and-white noir world of his memory, Charlie navigates the seedy underbelly of Philadelphia as Frank has been "diarrhea poisoned," and it's up to Charlie to clean up the mess.
During their trip to the Philadelphia Zoo, Mac sets up a text group chain for The Gang, but confusion sets in and The Gang must learn from the meerkats on how to communicate properly in a group.
Annoyed that the Gang failed to react as he nearly choked to death on an appetizer, Frank decides the Waiter, his savior, is the only person who has his back.
Landing in the middle of a focus group after a screening of "Thunder Gun 4: Maximum Cool," the gang is determined to restore glory and traditional American values back into the franchise, even if it involves sabotage.
Mac concocts a scheme to attract single women to rent Dennis' bedroom while Frank and Charlie make similar plans to draw in young, European coeds, but neither ad attracts their intended target.