It's the first day of fourth grade for Ritchie. When Christine and the other moms meet the class' disarmingly handsome new teacher, Daniel Harris, they decide to schedule a few parent-teacher conferences immediately.

Worried about Richard's indiscriminate dating habits and reluctantly realizing that she misses New Christine as well, Christine vows to bring the couple back together.

When Christine learns that Jeff, the new man in her life, is a grandfather, she is forced to rethink the relationship.

Christine is surprised when Ritchie expresses a newfound interest in religion after returning from a church festival with Richard and New Christine.

After announcing that she and her husband are getting a divorce, Barb moves in with Christine.

When manipulative moms Marly and Lindsay convince Christine to serve hot lunch at Ritchie's school, Christine finds herself serving with Stan.

Christine's attraction to Ritchie's teacher, Mr. Harris, causes a scene at a school fundraiser---especially after Ritchie wins a playdate with him.

When Christine realizes she can't afford the newly raised tuition at Ritchie's school, she tries to get help from everyone except the person who is offering it freely: Barb.

Annoyed that Ritchie finds his weekends with his dad more fun than his weekdays with her, Christine decides to make Richard responsible for helping Ritchie complete a big homework assignment.

Now that Barb is a co-owner of Christine's women's gym, the two women don't always agree on how to run it.

When Christine's modest hybrid car crashes into Marly's gigantic sports utility vehicle in the school parking lot, the women agree to take care of their own damage.

Christine reluctantly signs Ritchie up for soccer after Mr. Harris, informs her and Richard that Ritchie is having trouble making friends.

After Christine convinces Matthew to let her come with him to his friend's party, she learns about her brother's world outside of their home.

Christine resents that New Christine is reaping the benefits of all the time Christine spent trying to perfect Richard while they were married.

Sleep-deprived Christine's mood swings cause tension with everyone around her until she tries some potent new sleeping pills.

Christine worries that she has lost her ability to attract men.

Eager to make a difference in the world, Christine volunteers to collect signatures supporting an issue she doesn't quite understand--as she finds out from a competitive signature-seeker, Audrey .

Intending to send an e-mail about her relationship with Mr. Harris only to Barb, Christine accidentally sends the scandalous message to all of the parents at Ritchie's school, almost getting Mr. Harris fired.

Christine's controlling nature causes her to go too far and jeopardize one of Richard's construction jobs.

At the wedding of her ex-boyfriend, Christine agrees to be the designated driver for Richard, New Christine and Barb.

Ritchie is excited to go on his first overnight camping trip with his class, but Christine worries about him making it through the night without her.

Christine is stunned to discover that a night of fun may have resulted in an unforeseen consequence.