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.

The new "evolved" Charlie has to deal with a ghost from his old carousing, baseball-playing days when a unattractive woman he slept with just to break a batting slump shows up as a new patient in group therapy.

Charlie's plan backfires when he attempts to remedy his group with sleep-deprivation therapy.

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

Charlie falls for Jen's hot new business partner, Lori - played by Charlie's real-life ex, Denise Richards - only to find she thinks therapy is a scam. In the therapy group, Patrick asks Charlie to counsel the angry ghost of his mother, who he believes is haunting his apartment.

Inflamed by Kate's comment that he's only "nouveau smart", Charlie starts covertly dating a brilliant coffee-shop barista. The only problem is that the woman is turned on by sex where there's a chance of getting caught -- and she's Kate's patient.

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 has to evaluate the depth of his involvement in his patient's lives when he accidentally helps his patient who vicariously enjoys other people's anger hook up with a crazy woman.

Charlie gets an unexpected visit from his hyper-critical, bullying father. In the therapy group, Charlie attempts to help Lacey with road rage.

After Charlie and Kate have sex, he innocently asks her if she wants to go to a movie. Kate interprets this as a romantic gesture, rushes to fix him up on a date the next day with someone else and the two are forced to exam the nature of their odd relationship. At home, Sam kisses a girl at school and a picture of it ends up on Facebook.

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.

Charlie steals a hot woman from an angry nerd. Lacey takes drugs in order to sell drugs.

Charlie inadvertently picks up the sister of one of his most violent patients at prison.

Charlie suspects Jen's boyfriend, Sean, is cheating on her with his patient, Lacey. Also, Nolan's apartment gets robbed.

Charlie has to deal with the aftermath when his dad moves in with his patient Ed and they hit someone with their car. Also, Lacey takes Nolan out for a night of clubbing.

Charlie mistakenly becomes a sex surrogate for one of Kate's patients, who is a thirty-two-year-old virgin.

Charlie goes too far when he gets jealous of Jennifer's much younger boyfriend, Canvas. Meanwhile, Patrick helps Lacey look sexy for her first modeling gig.

Charlie is held hostage by his prison group during a riot.

Charlie and Kate are ready to sleep with the right people to get funding for their sex study.

Charlie tries to stop Kate from having sex with the executive in charge of funding their study; Charlie's dad tries to stop Lacey from throwing herself at a sleazy yoga instructor.

Charlie recruits Sean to help him throw the epic party of the century; Lacey inadvertently gets Ed hooked on drugs.

Charlie invites Ellie (Brea Grant), an attractive grad-student, to observe a therapy session only to have to compete with Nolan for her affection. Meanwhile, Ed and Martin come up with a plan to scam the government by hosting a disabled war veteran in their house.

Charlie invites a new therapy patient named Bob (Bob Clendenin) into the group, who casually tells everyone that he is the devil. Nolan makes a deal with Bob to sell his soul in exchange for Lacey falling in love with him. When Lacey is all over Nolan at the next session, even the skeptical Charlie starts to wonder. Meanwhile, Jen falls for a new neighbor while Sam falls for a young man who appears to be the neighbor's son, but the two are later revealed to be gay.

Charlie seeks his prison group's help when his partying ways result in him getting arrested.

Charlie is pursued by a hot reporter who wants to experience his sex study.

Charlie is in trouble when he finds out that a woman he had a one-night fling with is related to his supervisor.