Tommy copes with the loss of his father and a new man in Janet's life. Sheila finds a different way to deal with her issues while Sean, Franco, and Mike concoct a surefire way to get rich and laid.

An exotic woman comes by and that sparks mixed emotions in the house. Tommy deals with possible explusion from the FDNY and a new sponsorship role in AA.

After learning of Colleen's relationship with Shaun, Tommy decides that it's time for a talk about the birds and the bees. Tommy also decides to meet with the French reporter who's writing a book about 9/11, and issues raised by her book lead to friction between Franco and Mike. Meanwhile, Mike hits on a new theme for his bar; and Sean seeks out treatment for his bad back.

Lou wants to cooperate with Genevieve because he's interested in her. She's interested in Tommy, who isn't particularly interested in her, but he does watch some 9/11 footage she gives him, and what he sees is very disturbing. Meanwhile, Mike's bar opens; Sean's back still hurts; and Sheila's psycho-dramaturge tells her to "purge" herself of Tommy.

Lou sees the same thing on the 9/11 tape as Tommy did - and so does Sheila. Meanwhile, Sheila has a talk with Damien about his plan to join FDNY; Tommy gets to know Janet's boyfriend; Sean gets the results of his medical tests; and Colleen and Black Shawn discuss the parameters of their relationship.

Tommy takes Genevieve on a tour of Ground Zero and tells her why the 9/11 footage of Jimmy Keefe was so haunting. And Franco's 9/11 conspiracy theories come under attack. Literally. Meanwhile, Mike's bar proves to be a success; Tommy and Lou have a falling out; and Janet tells Tommy why she sent Katy to an upstate boarding school.

Franco finds a new way to vent his frustrations regarding 9/11, joining the FDNY boxing team. Tommy, still reeling from the 9/11 footage is trying to keep his grasp on sobriety and sanity intact, and finds an unlikely source for comfort; Lou and Tommy are still not speaking but have to put their differences aside when a friend is stuck in a dangerous apartment fire; Mike's bar is the newest hotspot for ladies and booze, but a group of rivals soon shake things up.

Tommy goes to see his psychic to find answers as to what happened to his cousin on 9/11, but it's what a fellow firefighter tells him that sends him over the edge. Lou runs into an old friend, hooker turned porn actress Candy. Franco is having second thoughts about joining the fdny boxing team after he finds out his first opponent is a woman. Tommy and Janet try to keep their new "no strings attached" policy quiet. Meanwhile, Sheila thinks of her own plan to win Tommy back; Black Shawn and Colleen try to hide their engagement but when Mike overhears the proposal he wonders if he can keep it from Tommy.

Sean goes for he first treatment in the hospital; Lou and Needles device a plan to gain from Franco being on the boxing team; Tommy meets a fiesty rock and roll critic but she actually has her eye on Damian. Uncle Teddy has gone missing and Mickey asks Tommy to help him find out where he went, but things take a turn for the worse when his wife shows up at the firehouse. Mike is in danger of losing his bar, and possibly facing jail time after a few underage girls sneak in and cause chaos.

Job safety requires Tommy and Mike to patch up their differences at work; Sheila uses her leverage to control Tommy's drinking; Lou resists the allure of an old flame.

Mickey learns that Tommy is drinking again; Sheila discovers that Tommy has been sleeping with Janet again; Sean tells Needles about his upcoming cancer surgery; Franco meets a gal in the gym; and Lou has another encounter with Candy.

The guys visit Sean in the hospital; Katy is home from school and wants a family dinner, one that includes Colleen and Black Shawn; and Lou and Tommy make a wager concerning the women in their lives.

After dealing with a particularly horrific accident on the job, Tommy questions his feelings in a dream sequence with his dead father, brother and son, and Jimmy Keefe. Meanwhile, Sean has an unwanted visitor at the hospital; and Lou has a very-much-wanted visitor to his apartment.

Franco has his first FDNY-tournament fight, and he and Carla have an encounter outside the gym; Candy cooks dinner for Lou; the guys have a surprise for Sean when they visit him in the hospital, and he has one for them. The guys also plan an outing for the kids in the cancer ward.

As Damien joins 62 Truck, Sheila reminds Tommy of his promise to watch out for him. Meanwhile, Janet gives Tommy guidelines for their relationship; the guys attend a memorial dedication for a firefighter who died on 9/11; and Sean is released from the hospital, vowing to live life to the fullest.

Tommy is cleaning the firehouse as punishment for yet another anti-authoritarian outburst when a mysterious woman strolls through. Meanwhile, Tommy's family confronts him about his drinking.

The perfect party becomes a nightmare when a herd of brutish women infiltrate the bar. Tommy's love triangle reaches new heights.

A trash-talking woman shows up at the firehouse looking for a date; Janet gives Tommy an ultimatum; Needles and Lou instigate a battle of the sexes; Sean has a new medical problem.

When Kelly continues to probe the firehouse for men, Tommy steps in to put a halt on her advances on Damian. Lou approaches Needles to act as a buffer to Tommy for the upcoming nuptials.

Tommy's encounter with Kelly goes a lot better than the one with Janet and Sheila. Meanwhile, the guys assist a newly domesticated Lou with his grocery shopping.

A failed rescue attempt leaves the guys in the dumps and Tommy tending bar to relive tension. Meanwhile, Franco climbs into the ring against a friend of Carla.

Despite a staggering personal loss, Uncle Teddy seems to be surprisingly stoic, but eventually bursts at the seams. Janet and Sheila leave a trial of destruction in the wake of a plan gone haywire.