A workaholic adult woman's imaginary friend from childhood comes back to her, but ends up being more of a troublemaker than a great companion.
Andy has a hard time finding a prom date while Dora keeps turning away a guy who persistently asks her, but Alice tries to convince her to go. Meanwhile, Ben struggles to deal with kids growing up and tries to scare away Dora's date.
Andy considers auditioning for the school musical, so Alice gets really involved and learns the emotional highs and lows of being a parent. Meanwhile, Dora creates her own feminist musical when she doesn't like the underlying message of Andy's show.
Ben asks Alice to help him with her first mom-like task: picking up Bunny from dance class, causing Mary to discovers the simplest parental tasks are fraught with difficulty. Later: Ben is disappointed to learn Alice can't help with the kids anymore, but things change when Andy enlists Alice's help to overcome his fear of taking a driving test.
Alice falls in love with a divorced dad but she then learns that he has 3 kids. Alice becomes consumed by her fears and contemplates giving up until her old childhood imaginary friend, Mary, comes back.