It's wedding day and Frank shows up uninvited - and high.

Frank offers to pay for Fiona's reception; when Sean worries that Frank will only hurt Fiona in the end, he confronts Frank.

Sean moves into the Gallagher house; Fiona plans a traditional wedding; Kev is unhappy about the green card marriage.

Fiona tries to make amends with Sean, who is uncooperative; Debbie and Queenie travel with Frank to a rural commune.

Fiona tries to get Sean's son to like her, but when he starts warming up to her, he takes a gun from the Gallagher house.

Carl struggles with Nick's absence, inviting his friends to the Gallagher home for a party; Frank and Queenie rule the house; Debbie returns.

Ian's relationship with Caleb gets more serious. Meanwhile, Lip is called to appear before a faculty disciplinary committee, but Helene accepts the blame for the scandal and tells the committee she will no longer teach or see Lip.

Frank helps Erica through the cancer concierge process; Debbie ups her game as a shoulder for Tyler to lean on; Lip tries to protect Helene from the fallout of Amanda's disclosure, but she refuses to see him anymore.

Fiona confronts Patrick about the eviction notice, but her only choice is to get a mortgage from the bank and bid on the house at auction. Meanwhile, Ian bakes cookies for the firehouse and discovers he was saved by the shift of gay firemen.

Frank teaches Debbie how to work the welfare system to her advantage. Meanwhile, Kevin and Veronica visit a paralyzed Yanis in the hospital and try to make amends, but Yanis arrives home and tries to kill the two Lisas with Kev's van.

Debbie carries a bag of flour around all day to prove Fiona wrong about her ability to raise a child while going to school, but she quickly realizes people are not as accommodating to mothers and babies as she hoped.

Frank's new found appreciation for life freaks everyone out; Fiona is determined to get Ian to take his meds; Debbie takes a pregnancy test.