12 Episodes · Premiered January 18, 2009 · Ended April 5, 2009
In the Season 1 premiere, suburban wife and mom Tara Gregson tries to lead a normal life with her husband Max and teenage children Kate and Marshall while suffering from multiple personalities including spunky teenager "T," gun-toting Vietnam vet "Buck" and '50s-style Betty Crocker homemaker "Alice".
Tara feels like a failure as a mother when she is unable to counsel her children about school and sex, so she turns to her perfect-homemaker personality "Alice" for help.
A date night with Max turns into a male-bonding session when Tara inadvertently becomes "Buck;" Tara's sister Charmaine recommends her for a large mural project.
Tara is feeling better than she has in a long time as her mural project progresses well and she makes a new friend, Tiffany - but Tiffany's curiosity about Tara's "alters" leads to a heartbreaking setback.
Tara turns into "T" and steals Tara's car, with Charmaine and Max in hot pursuit - leading Marshall to conclude it's the perfect time for him to throw a massive house party and get closer to his crush, Jason.
Tara and Charmaine's parents visit for the latter's birthday, but they have a secret agenda to take Tara and Max's kids to live with them.
Charmaine decides to get a breast augmentation and asks Tara to help her recover - then gets the surprise of her life when it's "Buck" who appears at her bedside; Kate counsels Marshall to play "hard to get" with Jason.
Max decides to embrace his time with "Alice," when Tara's personality is nowhere to be found; Marshall and Jason grow closer but only platonically.
Tara and Kate take a trip together, but end up in a fight that causes Tara to become "T" and head straight for the nearest tattoo parlor; Max uses his wife's time away to search for answers about her past.
Tara is shocked when her therapist terminates treatment, sending her into a meltdown with Charmaine and leading her to betray Marshall in a way that could destroy her family's trust forever.
Tara checks into a facility that specializes in dissociation, where she is urged to delve more deeply into her suppressed memories of the past.
In Season 1 finale, Tara comes face to face with an important person from her past, and begins to heal some of her pain by reconciling with Marshall.