When Mandy Maguire falls pregnant with Lip's baby, everyone thinks Ian's the father and the Maguire family welcome him into the family and scare him into proposing. As the Gallagher family unite with Chatsworth's most feared family, Lip, Ian and Mandy find their lives unravelling. Meanwhile, Frank is debt-ridden by Cassie Weston, the no-nonsense new landlady of the Jockey. Unluckily for him, she comes up with a plan to clear his large bar tab. Elsewhere, a late-night encounter with a tearaway bringa a new man into Fiona's life.