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.

Against her better judgment, Fiona continues her secret affair with Robbie. The situation nearly boils over when Mike shows up at Robbie’s apartment while Fiona is inside. Fiona is able to hide just in time before her infidelity can be exposed. Frank, in increasingly dire health straits due to liver disease, attempts to contrive an “accident” that will provide an ample insurance payout to cover the cost of a potential transplant.

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

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

Sheila gets an offer to buy her home. Plus, Fiona is off house arrest!

Frank enlists Carl to scare off the lesbians. Debbie throws a wild party.

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

Fiona's plans to announce her marriage unravel. Mickey asks for Lip's help.

Ian finds himself at the psych ward. Fiona decides between Jimmy and Gus.