Charlie blows up at his sister's baby shower.

Charlie wonders if his father is developing Alzheimer's.

Charlie begins a questionable romantic relationship with an ex-patient.

Charlie's dad falls in with a bad crowd.

Jennifer moves in with Charlie temporarily and Kate gets jealous.

Charlie tries to help his patient with a placebo pill that supposedly reduces anger.

Charlie dates his daughter's teacher.

Charlie takes on Cee Lo Green as a therapy patient.

Charlie and Kate face off as expert witnesses in the same trial.

Martin has Charlie's daughter baptized behind Charlie's back.

Charlie dates Jennifer's business partner and finds out she has sexual anger issues.

Lindsay Lohan comes to Charlie for therapy and they begin a tumultuous relationship.

Charlie's neighborhood is up in arms when they find out he's been having clients with anger issues meeting at his home.

Charlie takes the group on an equine therapy retreat.

Charlie inadvertently puts two patients together in a romantic relationship.

Charlie gets jealous and uses a patient to spy on Kate.

Charlie lets his father help him coach a high school baseball team with bad results.

Charlie's ex causes him problems with his group when she becomes one of his patient's life coach.

Martin tells Kate that Charlie and Jennifer are getting back together.

Charlie shakes up his relationship with Kate while dealing with the return of Jen's ex-boyfriend.

Charlie begins seeing a new female therapist who used unorthodox therapy methods; Patrick tricks Ed into thinking he won the lottery.

Charlie and Kate try to control their sexual urges as they begin work together on their sex study; Lacey starts a new job as a pharmaceutical rep.

Charlie discovers scandalous information about Jen's new boyfriend, Sean, when he joins his therapy group.

Charlie breaks all the professional rules by starting a friends-with-benefits relationship with a hot woman subject from the sex study. Also, Nolan and Patrick fight over a woman.

Charlie's trip with the group is interrupted when he gets some interesting news from Kate. Also, Charlie's house is unwittingly used for a porno shoot.