On tonight’s special two-hour Private Practice, Addison (Kate Walsh) performs a complex in utero surgery, proving not only her talents to her father but also finally giving them some common ground. Meanwhile Sam (Taye Diggs) and Naomi (Audra McDonald) deal with their own family crisis when they discover their daughter is growing up way too fast, and Violet (Amy Brenneman) does the unthinkable. On the second part, a terrible explosion at Dell's (Chris Lowell) house lands Betsy (Hailey Sole) and Heather (Agnes Bruckner) in the hospital, and everyone is pushed to the limit trying to save their lives. Tensions rise even higher between Addison and The Captain (Stephen Collins) when her mother, Bizzy, shows up and a shocking family secret is revealed.