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 visitor sparks mixed reactions in the firehouse. Tommy deals with the possibility of expulsion from the FDNY and a new sponsorship role in AA. As Mike and the guys renovate their new bar, Sheila learns that being a big sister isn't always easy.
Tommy makes a shocking discovery regarding Jimmy's whereabouts on 9/1l. Sheila takes drastic measures to purge the negative energy from her life as Sean's back pain gets worse. The bar, however, finally takes a turn for the best as the guys enjoy a fruitful opening night.
After a run in with Janet's brash new boyfriend, Tommy grows concerned about Katie's whereabouts. Sheila is finally able to come to terms with Jimmy's death as Damien makes the decision to follow in his father's footsteps.
A personal milestone finds Tommy back at Ground Zero. Genevieve's perspective on 9/11 incenses Tommy, whereas Franco's point of view has more dire consequences. Meanwhile, Sean's back pain turns out to be more serious than he had expected and the success of Mike's bar becomes a handful.
Tommy and Janet attempt to survive a weekend together at Katy's new prep school. Meanwhile, Lou sees Tommy's absence as a way to move in on Genevieve. Teddy and Maggie receive vulgar propositions and Sean's stomach pain acts up at an inopportune moment.
A late-night cleanup turns into a nightmare for Tommy when several unexpected visitors stop by the bar. Feinberg allows Damien to ride along with the crew, but may not be prepared for the consequences.
Tension runs high as Needles holds the guys accountable for their lack of judgment. Tommy steps up and takes responsibility for Damian's future in the firehouse. Sheila provides Tommy with an oasis as a sign of her gratitude but it may not be enough to save him from the wrath of Mike, Dwight, and the ghosts of Tommy's past
Tommy and Mike must lay their differences aside when a roadblock puts a dangerous halt to a routine call. Sheila uses her leverage to control Tommy's drinking, while Lou refuses to give in to the allure of an old flame.
Though Tommy's pacts with Sheila and Janet have begun to unravel, there is one Gavin who remains sexually adventurous much to Tommy's chagrin. Garrity divulges his medical secret, Tommy proclaims he's been drinking at AA, but its Mickey who will offer the final surprise.
The stakes are high between Lou and Tommy as they vie to be the last single man standing. Garrity looks worse than the guys had expected, but have no idea just how far from reality he has drifted.
The crew gathers to show their support for Franco as he steps into the ring. Sean reveals his shady financial scheme and things quickly turn from bad to worse when an act of good will backfires on the crew.
Damian's graduation ushers in a new era at the firehouse - one steeped in brotherhood, tradition, and hazing. It's all fun and games until Tommy's decision to protect Damian leaves the rest of the crew in a dangerous position.
When Tommy has to clean the firehouse due to his defiant ways, a mystery woman suddenly makes an appearance. Meanwhile, when Tommy's drinking begins to cause problems, his family confronts him.
A no-nonsense woman shows up at the firehouse talking trash and looking for a date. Janet offers Tommy an ultimatum, Needles and Lou concoct a battle of the sexes, and Sean's medical condition takes a trip below the belt.
When Kelly-- a headstrong recent save-- 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.
Things spin out of control when Franco takes to the ring against one of Carla's butch cohorts. Tommy bartends to relieve tensions after a failed rescue sees the guys down and out.
Uncle Teddy appears surprisingly stoic after a staggering personal loss, but finally bursts at the seams and has the gang cornered. Janet and Sheila's plan goes haywire and leaves a trail of destruction in its wake.
