Newly sober single mom Christy is challenged when her estranged, overly critical mother returns to her life in the series premiere of this comedy from executive producer Chuck Lorre.

Christy and Bonnie set aside their differences to deal with a family crisis together.

Christy goes on her first date since she stopped drinking. Meanwhile, Bonnie teaches her grandson Roscoe to gamble.

Christy’s patience is tested by everyone she knows. Meanwhile, Bonnie runs into an old rival.

Christy makes a new friend who has big problems. Meanwhile, Bonnie attempts to put someone else's needs ahead of her own.

Christy is determined to take things slow in her relationship with Adam. Meanwhile, Bonnie and her rival from AA, Marjorie, disagree on what "taking it slow" means.

Christy squares off against Luke's conservative parents, who are upset about Violet's pregnancy. Meanwhile, Bonnie is determined not to let menopause get the best of her.

Christy is nervous about going on a romantic weekend getaway with Adam. Meanwhile, Gabriel's wife suspects he is cheating and seeks comfort from Christy.

Bonnie struggles to keep her life together when she loses her job; Christy tries to help Bonnie get back on track.

Christy has trouble accepting how much easier life is with Bonnie in the house. Meanwhile, Baxter sets up camp in the driveway.

When Christy and Bonnie find out that Marjorie has cancer, they attempt to make their best to support her, while they try to apply her strength and patience their own lives.

When Bonnie starts dating chef Rudy, Christy winds up stuck in the middle.

Despite an injury, Christy refuses to admit that she needs Bonnie's help; Luke asks Baxter for advice about fatherhood.

Christy and Bonnie come clean about the secrets they've been keeping from each other. Meanwhile, Violet and Luke discover they have different ideas about parenting.

Christy tries to start a relationship with her father, Alvin, while Bonnie struggles to accept the fact that Christy wants him in her life.

Christy is tempted by her old vices when she dates an attractive, hard-partying man named David. Bonnie decides her advice is worth money and becomes a life coach.

Bonnie must pick up the slack when Christy puts her new relationship with David ahead of family and friends.

When Violet feels nervous about becoming a mom, Christy plans a baby shower for her; Bonnie lands a new client.

Bonnie and Christy help Regina tie up loose ends before she goes to prison; Alvin gets acquainted with his grandchildren.

Christy and Bonnie try to make sure everything goes smoothly when Violet finds the perfect couple to adopt her baby.

Tensions are raised between Alvin and Bonnie, leaving Christy caught in the middle; Violet is worried about going to prom.

Bonnie and Christy help Violet as she goes through labor; Christy thinks Bonnie still has feelings for Alvin.

Bonnie is furious when Christy's poor financial decisions threaten the family's living situation. Meanwhile, Christy agrees to help out Jill, a woman who is newly sober.

Christy convinces herself that everything is fine even though her family is basically homeless. Surprisingly, Bonnie is the one who tries to bring her back to reality.

In order to get the family back together, Christy and Bonnie rent a house with a colorful past. Meanwhile, Bonnie tries to broker a peace between Christy and Alvin.

While Christy tries to get to the bottom of Violet's erratic behavior, Bonnie attempts to get a job.

Christy has mixed feelings about Candace and Baxter's relationship and things heat up between Alvin and Bonnie.

Christy and Bonnie are in the lap of luxury when Christy's wealthy sponsee, Jill, asks them to keep her company on her first night out of rehab.

Christy tries to make amends for her past deeds. Bonnie takes a cue from her and decides to make up for treating Alvin so poorly through the years.

Family secrets surface when Christy and Bonnie join Violet's therapy session.

Christy's evening alone takes an unexpected turn when she meets her attractive, single neighbor, Andy. Bonnie and Alvin's romantic plans are derailed by Alvin's ex-wife, Lorraine.

Realizing she has been a waitress longer than she intended, Christy moves toward a career change; Bonnie and Alvin try to revisit their youth.

An unexpected death rocks the Plunkett household.

Christy does damage control when Bonnie acts out after the death of a loved one.

Concerned about the way Bonnie is handling Alvin's death, Christy tries to get her mother professional help.

When Christy gets promoted to manager of the restaurant, she discovers that being the boss comes with its own set of problems. Also, Bonnie has a nemesis in the building who wants her fired.

Christy makes a discovery about what excites her; Bonnie takes her new role as secretary a little too seriously.

Christy and Bonnie are shocked when they discover how prison has changed their friend Regina.

Christy and Bonnie worry when they find out that Violet's new boyfriend is old enough to be her father.

Christy brings Bonnie to a handsome doctor after she injures her back.

Bonnie goes to extremes to keep a major secret from Christy.

After Bonnie’s relapse, the women from her meeting rally around to help her through withdrawal from painkillers, but Christy wants no part of it.

Christy and Bonnie prove to be unwelcome guests wherever they go due to their testy relationship.

Christy blames Bonnie when Roscoe announces he wants to go live with his father, on the second season finale.

Bonnie's estranged biological mother arrives, prompting Bonnie and Christy to clash over the notion of forgiveness.

Christy and Bonnie try to help Jodi, a teenage addict they met at their meeting.

After Christy and Bonnie get Jodi, a recovering drug addict, back on her feet, they find themselves addicted to the rush of helping others and take on a new “project,” Michelle.

Christy is thrilled when Violet tells her she wants to spend more time together and improve their relationship. Also, Bonnie tries to make amends with her nemesis in the building, Beverly.

Christy feels threatened by Baxter's girlfriend in the wake of Roscoe's parent-teacher conference. Bonnie flirts with an unlikely target.

Regina doesn't think she's an alcoholic and Wendy encourages the ladies to attand a sober holiday dance.

Christy hosts a dinner attended by Violet's future mother-in-law, who is hard to please. Steve wants to take his relationship with Bonnie to the next level.

When Christy catches the eye of Candace's wealthy, charming father Fred, Candace and Baxter are outraged while Bonnie pushes Christy to give him a chance.

Christy's burgeoning relationship with Fred gets more and more difficult for Candace to handle. However, Bonnie enjoys the perks of Chrsty dating a wealthy man.

In order to avoid her ex-boyfriend, Bonnie drags Christy to a new AA meeting, only to run into her ex-girlfriend, Jeanine, from 30 years ago.

Christy tries to help Julian (Joe Manganiello), a handsome, newly sober AA member, but her attraction to him complicates things. Meanwhile, Bonnie jumps at the chance to attend a lavish charity gala with Jill.

After Marjorie reveals her plans to get married, Christy and Bonnie want to make sure she has a really special day.

Christy, Jill and Wendy find themselves in a sticky situation when they agree to help Bonnie smuggle an illegal substance across the Canadian border.

Christy tries to be supportive when a health scare throws Bonnie into a tailspin.

Bonnie tries to get Christy to admit that she still has feelings for her ex-husband, Baxter.

When the restaurant closes for renovations, Christy takes a job as Jill's personal assistant. Also, Bonnie answers a wrong number and falls for the guy on the other end of the line, Adam.

Christy encourages Bonnie to go out with a great new guy, Adam, only to find out he's not as great as she thought.

When Jodi's boyfriend, Travis (Jesse Luken), who was with her when she overdosed, shows up at an A.A. meeting, Christy struggles to show him the compassion he needs. Also, Bonnie's new boyfriend, Adam (William Fichtner), feels left out because she spends so much time at A.A.

Despite being extremely ill, Christy insists on taking her final exams. Also, Bonnie is furious when she suspects her boyfriend, Adam, is cheating on her.

When Christy learns she made the Dean's List at school, she is disappointed by Bonnie's lackluster response.

Christy and Bonnie don’t know who to believe when they hear conflicting stories about Violet and Gregory’s break-up,

Christy's dream of becoming a lawyer is in jeopardy when she is hit with the reality of how much her education will cost. Also, Bonnie becomes the disciplinarion with Violet back at home.

In the fourth season opener, Bonnie and Adam's relationship is tested when he moves in with her and Christy for a few weeks. Also, Christy learns the hard way that it may be a mistake to try and meet men with Jill.

Christy considers giving up her dream of becoming a lawyer when Bonnie's ex-girlfriend, Jeanine, offers her a lucrative job in real estate. Also, Adam is very curious about Bonnie's past with women.

Bonnie fears she's become undesirable when she catches Adam smoking pot before sex, and Christy tries to smooth things over between them.

Christy and Bonnie worry that Roscoe has a drug problem when Baxter and Candace catch him smoking pot.

Christy and Bonnie rush to a sick Violet’s side, only to find out that having mono is the least of her worries.

Christy becomes overprotective and keeps a constant eye on 12-year-old son Roscoe after discovering he's been using drugs and alcohol.

Christy and Bonnie worry about Jill after her cry for help on the anniversary of her mother's suicide.

Christy and Bonnie dip back into illegal activities, and Adam questions their morality.

Christy and Bonnie have their hands full when Adam’s hard-partying friends come for a visit.

Christy feels left out when Bonnie and the ladies keep Jill’s pregnancy a secret.

Bonnie encourages Christy to pursue Marjorie's charming nephew, Nick, despite the fact that he's been declared off limits.

Christy, Bonnie, Jill and Wendy accidentally eat pot-filled cookies.

Christy is worried Bonnie is jeopardizing her relationship with Adam when Bonnie connects with a handsome stranger.

A heartbroken Bonnie drives everyone crazy, so Christy begs Adam to take Bonnie back.

When Bonnie discovers Adam is still close with his ex-wife, Danielle, Christy worries the emotional fallout could jeopardize Bonnie’s sobriety.

When Christy and Adam get into a car accident, Bonnie is hurt to discover she is neither of their emergency contacts.

Christy helps Jill adjust to being a new foster mother, and Bonnie has trouble convincing tenants that she’s a good building manager.

Following the death of Bonnie’s mother, Christy and Bonnie learn that she kept a very big secret.

Christy annoys everyone when she adopts her new boyfriend Brad’s healthy lifestyle, and Bonnie and Adam decide to take the next step in their relationship.

When Marjorie takes a break from the group, Bonnie becomes the go-to for everyone's problems and Christy tries to overcome a painful memory from her past.

Christy and Jill take Emily to see her biological mother, Natasha, in rehab where they make a surprising discovery, and Bonnie watches Adam’s dog while he’s out of town.

In the season finale, Christy tries to help when Bonnie gets into trouble with the IRS but, realizing she’s in over her head, she encourages Bonnie to seek help from her newfound brother, Ray.