A new character will be added to Tara's alter ego in "United States of Tara". The character who suffers multiple personality disorder will not only have three but four different personas which reportedly will be teased in the end of next episode. Writer Diablo Cody said, "There may be other alters."
Outside her true self, Tara who is played by Toni Collette, has possessed three personalities which are suburb housewife named Alice, beer-gulping male named Buck and a wild and pot-smoking teenager named T. The additional personality is not yet revealed though whether it will be a female or male.
The next episode will be aired on Sunday, February 22 under the title "Transition". The family is under the impression that Tara's parents, Bev and Frank, are visiting to celebrate Charmaine's birthday. But when Frank approaches Max about taking the kids to live with them, Max does everything he can to prevent Tara from switching.
At the party that night, Tara learns of her parents' plan and is hurt that they think she is an unfit parent. Sweeping her feelings under the rug, she remains calm. However, later that evening, Max wakes to find something that changes everything.