Frank and Monica rekindle their self-destructive relationship after Frank's mother returns from prison to wreak havoc; Fiona is thrown for a loop when Steve returns from Rio with a surprise; Lip makes big changes in preparation for the arrival of his and Karen's baby; Karen and Sheila clash over Karen's new husband Jody, a good-hearted but weird guy she met in Sexaholics Anonymous; Ian tries to get into West Point; Debbie prepares for the onset of puberty; Kev and Veronica contemplate starting a family.
