Frank re-lives his 20s and joins the workforce for the first time! Fiona grapples with evicting someone from her building. Lip works out a plan to sabotage Charlie's chances with Sierra. Ian and Carl make a troubling discovery about Monica. Kev says his goodbyes as he prepares to go under the knife.

A blast from the past shakes up Fiona's view of her life. Frank gets involved with Liam's school and becomes the most popular dad in the PTA. Lip learns getting laid is harder than anticipated when sober. Ian crosses a boundary with a kid from the youth center. Kev and V take a trip to meet his birth family.

As Fiona tries to raise the profile of the neighborhood, Ian helps Trevor to raise money for a new youth shelter. Meanwhile, Carl loses his scholarship and gets creative with securing the tuition, Lip stands up to a friend and gets hurt and Frank teaches the parents at Liam's school all about the working class.

Ian tests Fiona's patience and resolve by bringing a messy “Occupy Fiona” movement right to her front door. Lip struggles to get Professor Youens to court for his DUI trial. Meanwhile, a now unemployed Frank goes on a job hunt and Carl gets a feisty new rehab client with a plan to help him get the rest of his tuition.

Frank starts a booming import-export business. Fiona considers moving into her own place after Ford shows her a side of Chicago she's never seen. Meanwhile, Lip interviews new sponsors, Ian confronts a pastor trying to "pray the gay away" and Debbie deals with being unemployed while looking for a way to afford school and raise Franny.

Fiona taps deep into her Gallagher roots to get the homeless family out of her apartment and dismiss their lawsuit. An explosive incident sends Ian and some of his followers into hiding from the authorities. Meanwhile, Lip makes a difficult decision in order to have the life he really wants, Carl looks for a way to go back to school without upsetting Kassidi, Debbie considers letting Derek back into Franny's life and Frank makes plans to take advantage of Liam's rich friend. Season finale.

Fiona makes a play for a risky investment opportunity, ignoring Ford’s advice. Frank discovers the financial incentives of local politics. Carl bolsters his West Point application in unexpected ways. Debbie struggles to find allies in her battle against sexual harassment. Ian is overwhelmed by the growth of the Gay Jesus movement. Kev and V try to find the perfect preschool for the twins.

Election day puts Frank and Fiona in a head to head battle as they each try to round up votes for their candidates. Lip has to make an important choice about Xan’s future. Debbie gets in over her head with Alex. Carl’s killer instinct is put to the test. With his trial looming, Ian struggles to decide how to plead. 100th episode!

Frank’s new liver medication comes with tragic side effects. Ian tries to get away from Fiona’s hovering. Lip has to keep himself occupied during a day of temptation. Carl makes a connection at a West Point mixer. Debbie tries to repair things with Alex.

Liam out-Gallaghers Frank, Lip works to convince Tami to stay in Chicago with their baby, Debbie turns over a new romantic leaf and Kev’s new business takes off, but V wonders where the money is going.