During Fiona's wedding Debbie shows up at the church with Franny, and Frank arrives uninvited and high, and reveals that Sean is still a practicing junkie. Meanwhile, Ian brings Caleb to meet the family; and Sean tries to do everything he can to keep his son in his life.
Frank offers to pay for Fiona's wedding reception and then goes scamming around town to raise the money. Meanwhile, Sean fears that Frank will end up hurting Fiona and confronts him on it. Their difference of opinion quickly descends into a brawl.
Sean officially moves into the Gallagher house; Fiona plans a traditional wedding; Kev tries to find a way around V and Svetlana's pending green card marriage.
Fiona tries to make amends with Sean, who isn't giving her the time of day. Meanwhile, Debbie and Queenie travel to Queenie's rural commune along with Frank who is trying to escape G-Dogg who's after him for stealing his drugs.
Fiona, now living with Sean, attempts to get his son, Will, to like her. He starts to come around, but when Will snags one of Carl's guns at the Gallagher house, Sean catches him and is furious with Fiona, worried he'll lose custody.
Carl struggles with Nick's absence, continuing to put up false hood bravado. He takes over the Gallagher home, remaking it as his "crib" and inviting his friends over to party and make music. Frank and Queenie rule the house - and Debbie returns when she's let go by Erica and Tyler.
Ian and Caleb get serious. Lip appears before a disciplinary committee.
Frank helps Erica as Debbie ups her game. Lip tries to protect Helene.
Fiona confronts Patrick. Ian makes a discovery at the firehouse.
Frank teaches Debbie how to work the system. Kev and Veronica visit Yanis.
Debbie carries a bag of flour around - determined to prove Fiona wrong.
Frank's newfound appreciation freaks the Gallaghers out.
