In the series finale, Tara and Max head to Boston to see the expert doctor recommended by Dr. Hattaras. Elsewhere, Neil and Charmaine pack their bags for Houston and his new job; Evan proposes to Kate; and Marshall ponders where to go to college.
While grieving the loss of Lionel, Marshall decides to get away from the family and move in with Grandma Sandy (Frances Conroy). Tara's superdestructive alter Bryce takes over his room and runs amok among the Gregsons. Meanwhile, Neil pressures Charmaine to relocate to Texas; and Kate spends the majority of her time in St. Louis with Evan and his son.
Upon their return from New York, Max and Marshall are greeted with disappointing news about Dr. Hattaras leaving the university, and even more disturbing news involving Lionel. Meanwhile, Tara rids the house of all traces of Bryce while under a heavy dose of medication; Neil rustles up a job in Texas and tries to persuade Charmaine to pack up the baby and relocate; and Kate and Evan's relationship continues to evolve.
Tara manifests an abusive new alter, so Dr. Hattaras brings her to meet the cochair of the Psychology Department. Meanwhile, Marshall is disappointed and confused about Max's reaction to his student film; Kate continues her long-distance relationship with Evan, but his bratty son complicates matters; and Charmaine and her new friend get chummy with a gaggle of chic mommies.
A frightening incident at a local corn maze triggers Tara's transition into Chicken and she takes flight. Elsewhere, Marshall's movie is accepted into a film festival in New York and he asks Max to accompany him, unaware of his father's fear of flying; an encounter with Evan's bratty son has Kate rethinking their relationship; Charmaine's attempt to get some me time at a spa leads to a meeting with a "fierce mommy"; and Alice shows up in Dr. Hattaras' office.
Max gets a double dose of positives in his life when Tara, with help from Ted Mayo, sets out to reunite his former rock band and also plans a birthday party for him. Meanwhile, a moody Dr. Hattaras cancels a session with Tara, which doesn't sit well with Max; Kate ponders her bumpy relationship with frequent-flyer Evan; and Marshall and Noah cram for their film-festival submission with a surprisingly revelatory interview with Max.
Tara is excited about the new contract she's entered into with her alters, but Dr. Hattaras remains skeptical. Elsewhere, Neil invites Tara and Charmaine's mother to visit the new baby, much to Charmaine's chagrin; Max feels he's on shaky ground at OrgaLawn; flight-attendant Kate enjoys the friendly skies with a frequent flyer, but comes crashing back to Earth when he rebuffs her advances; Marshall and Noah bond while prepping their film-festival entry.
Tara is stymied in her attempt to drop Dr. Hattaras' psych class, and the professor confounds her with an alternative proposal. Meanwhile, new parents Charmaine and Neil are swamped with the responsibilities of raising a baby, and she is determined not to let Tara near the child; Max's new job is proving troublesome, as is his new boss; Kate begins flight-attendant school and lands a demanding veteran trainer; and Lionel catches Marshall and Noah together, endangering their student-film entry.
Charmaine declares her baby off-limits to Tara as the two share an ambulance. Elsewhere, Tara's psychology professor is intrigued to learn she tried to strike a bargain with her alters; Marshall, Lionel and Noah have some creative ideas about what to do with Charmaine's empty house; and an embarrassed Kate fesses up to backing out of her Japan trip.
Between college and planning Charmaine's baby shower, Tara reaches a breaking point and transitions, which sets off a battle royal among her alters for control. Meanwhile, a natural disaster puts a crimp in Kate's plan to go to Japan, but an encounter with an attractive flight attendant has her flying high and contemplating employment opportunities in the States; and Max visits his compulsive-hoarder mother to get her to sign off on the sale of his business.
Tara's abnormal-psychology class receives a surprise visitor when she transitions into her psychiatrist alter, Shoshanna, whose idea to lecture the class doesn't sit well with the professor (Eddie Izzard). Meanwhile, a competitor's offer to buy Max's business may leave Neil out of a job; Kate contemplates an offer to go to Japan to teach English, and neither parent is ready to tell her sayonara.
In the third-season premiere, Tara decides to go back to college, which Max doesn't think is a good idea and frets that the stress may conjure up one of her alters. Meanwhile, Kate contemplates her future; pregnant Charmaine still won't commit to Neil; and Marshall and Lionel go in on a video camera for their filmmaking class.