Addison's father, "the Captain," shows up and turns her whole world upside down.
She blames her cheating on Derek on him, though, and tells him she's not his family, because the people she works with are.
Heather, a patient we've seen before, returns. As does Dell. He's married now. To Heather. Everyone at the practice freaks, and Violet and Naomi stage an intervention.
Then Violet visits Heather. Dell yells at her, and says what we've all been thinking - how she hasn't been there for her own son, how she left Pete, etc.
He says he loves Betsy, but he did this because he loves Heather.
Meanwhile, Charlotte's still in the doghouse after having lied about being married before, then Cooper turns out to be the liar when Evan's mom shows up demanding to know where his son is.
Cooper does know, but since Evan said his stepdad abused him, there's no way he's telling.
He even goes to jail and gets beaten up, but still won't talk. Facing 5-10 years in prison? Still not talking.
Charlotte becomes his accomplice, but Addison gives them up, and Evan's dad gets arrested.
Evan then stabs himself and admits to Charlotte that his stepdad never abused him; he just did it to bring his parents back together.
She tells Cooper and they have a big fight, then she opens her heart up and explains why she lied, and he brings up the almost wedding, which is even worse now that he knows there was one before.
When Addison tries to tell him she told to protect him and the practice, he tells her he gets she thinks they did the same thing (protecting those they love), but that she's wrong and he was right.
There's also a patient(s)-of-the-week storyline in which a pregnant woman wants her dying husband to meet the baby.
The cancer patient is Pete's, and he thinks positive thinking is the key, but Fife has an experimental treatment to try.
When it doesn't work, he suggests Addison deliver the baby six weeks early so the father can meet her, and the mother can one day tell her that her dad held her and loved her.
Addison balks until Pete convinces her by playing the Lucas card. It works and there's happiness all around for the baby, dying dad, and mom.
Naomi learns that underneath Fife's rough exterior is someone who cares about his patients.