Summary To rid their neighborhood of undesirables, Mac and Dee become vigilantes, and Frank and Dennis impersonate police officers. They enjoy the feeling of power this gives them…perhaps too much. Our Take Very good — not the series’ peak, but an hour that reminds you why It’s Always Sunny in Philadelphia works.

Summary A now-homeless Father Mara is employed to sell drugs on the street while Dennis embarks on life as a gigolo; and Mac tries to join the mob. Our Take Solid, satisfying television. The season’s engine keeps turning and the character work pays.

Summary A misunderstanding with the mob over a set of speakers and a stash of cocaine prompts Dennis to hire himself out as a male escort. It’s that, or he and the rest of the gang will get whacked. Our Take Confident and engaging. The plot moves, the stakes feel real, and the hour flies…

Summary Dennis is mistaken for a recently released child molester; Mac tries to bond with his ex-con father, who can’t take his eyes off a creeped-out Dee; and Frank moves out of the apartment he’s been sharing with Charlie, and moves in with Charlie’s mother. Our Take Solid, satisfying television. The season’s engine keeps turning…

Summary Mac has been acting strangely, leading Frank, Dennis and Dee to believe that he’s the serial killer who has been terrorizing Philadelphia. So they set out to catch him, but for Dennis and Dee, that means they must first learn to think like serial killers themselves. Frank, meanwhile, is content to let a chainsaw…

Summary Dee dates a famous local rapper and it could turn out to be true love, even though he might be mentally challenged. In any event, his success inspires Mac, Dennis, Charlie and Frank to start their own band. Our Take A well-built episode with more hits than misses. Worth your time.

Summary The gang want to become local celebrities, so Mac and Charlie create their own newscast on a public-access channel, while Dennis and Dee set out to make a splash on the club scene. Our Take Solid, satisfying television. The season’s engine keeps turning and the character work pays.

Summary The gang agrees to sell Paddy’s after getting an offer that’s too good to turn down. Problem is, Dee and Charlie, who aren’t partners, must get real jobs. Members of Frank’s “gang,” the Yellow Jacket Boys, are played by members of the doo-wop group The Mighty Echoes, who perform. Our Take Serviceable television —…

Summary The gang declares war on a Korean restaurateur who threatens to bump Paddy’s from its coveted and profitable spot on the city’s annual pub crawl. Meanwhile, Dee is determined to hold a talent show, primarily because she wants to win it. Our Take Serviceable television — it advances the story without ever surprising you.

Summary Dee gets a rude awakening when she discovers that “Fatty Magoo,” an overweight loser from her high-school class, is now a svelte, successful clothing-store owner. So Dee decides to design a dress for her, but Dennis decides that he’s the better designer. He also knows that he has the charm to sell it to…