Frank returns, disrupting life; Lip attends college; Ian is missing; Fiona tries to connect with Debbie and Carl.

Fiona begins to enjoy the perks of living life just above the poverty line. She uses her newly activated health benefits to take the kids for checkups. However, when a road rage incident damages the company car, Fiona tells a much bigger lie about how it happened. Meanwhile, Lip seems to have lost his mojo as he struggles in school and with the ladies.

Frank stalks his previously unseen daughter, Sammi, and is surprised to find out she has a son, Chuck. Meanwhile, Fiona and Mike are getting serious. Also, Carl begins stealing dogs and holding them for ransom so that he can earn some drug money for Frank. Sheila has her first successful online date with Native American cowboy Roger Running Tree.

Guardianship duties fall upon Lip - who gets some unexpected assistance.

To prepare for a visit from her probation officer, Fiona must remove all paraphernalia from the house; Ian is kicked out of Mickey's house.

Carl connects with a girl in detention; Lip and Amanda grow closer; Sheila returns with big plans; Fiona searches for a job; Mickey spends time with Ian.

Fiona violates terms of her probation, sending the family into search party mode.

Fiona is hauled off to a correctional facility. Amanda’s parents bribe Lip.

Fiona gets out of jail. Frank is feeling like his old self.

Fiona juggles her job and a crush. Lip heads back home.

Frank retraces the path of an epic bender. Fiona and Gus head to city hall.

Fiona is thrown into chaos by the return of Jimmy. Ian takes Mickey's baby.

Gus tells Fiona he's leaving to go on tour. Frank seeks revenge on Sammi.

Frank has a ball with his new sick friend and formerly uptight doctor.

Fiona reunites with Gus. Frank works to keep Bianca happy. Season finale.

Frank helps Erica as Debbie ups her game. Lip tries to protect Helene.

Ian and Caleb get serious. Lip appears before a disciplinary committee.