Charlie - a baseball player with anger issues turned anger management therapist - decides to return to therapy after a bad run-in with his ex-wife's new boyfriend. The only problem is he just happens to be sleeping with the one therapist he trusts: his best friend, Kate.

Kate steals a patient from Charlie, fueling the competitive rivalry between the two therapists.

Charlie and his ex, Jennifer, are having an issue with how Charlie still tries to manage her life when Cleo - one of Charlie's patients from his prison anger therapy group - shows up on his doorstep, fresh out on parole. Jennifer decides to get back at Charlie by dating the ex-con.

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

Jennifer moves in with Charlie temporarily and Kate gets jealous.

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

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

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

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

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 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 is held hostage by his prison group during a riot.