Whitney and Alex celebrate their unofficial wedding day and Whitney is thrilled when her mother Candi (Jane Kaczmarek) pays a visit. However, she is soon brought to tears when her mom leaves abruptly. Alex's response to the situation makes things even more awkward. Meanwhile, Lily and Roxanne try to decide on an appropriate wedding gift for Whitney but cannot agree on the perfect present.
Alex and Whitney decide to share a joint checking account as Whitney is hard up for cash. The plan goes awry after she is less than impressed with Alex's finances and from there the penny pinching begins. Meanwhile, Mark makes a rash decision and buys a bar to the chagrin of everyone.
After Alex reveals he "faked it", Whitney decides they need to come clean about their past lies. Lily reveals too much about Whitney's former life to Alex. Meanwhile, Mark hires R.J., (Tone Bell), the new bartender at Low Bar, proving to be fresh meat for Roxanne and Lily.
When Alex takes an accidental dive off stage while speaking at his alma mater, Whitney's reaction is less than heartwarming. Meanwhile, R.J. (Tone Bell) tries to school Mark on the art of chivalry using Lily as an example.
When Alex agrees to let his ex-fiancé Chloe crash on his couch during her stay in town without notifying Whitney, he finds himself in trouble. Instead of consoling his current significant other, he has to cater to his ex, putting Whitney in an awkward situation. Meanwhile, Roxanne lets Lily use her apartment for some alone time with a date and ends up crashing for the night with Mark.
While trying to uncover what has been making Alex's allergies flare , Whitney reveals a heart condition that has plagued her since childhood. Meanwhile, Lily introduces the gang to her new beau, but they find that he tends to have a hard time getting to the point and Mark, Roxanne and R.J. find themselves rushing to finish his sentences.
When Whitney is contacted by a terrible ex-boyfriend who is looking to make amends, Alex warns her to stay away, but Lily encourages her to arrange a meeting. However, when Whitney meets him she finds out that old habits die hard and Alex is forced to defend her honor. Meanwhile, R.J. reveals to Roxanne that she may have a thing for Mark.
In an effort to have some time by himself, Alex lies to Whitney about going away for a tech seminar. However, Whitney soon uncovers the truth and makes them go to couple's counseling. Meanwhile, to Lily's surprise, R.J's eight-year-old niece takes a liking to Roxanne.
When Alex's abrasive brother comes to visit, Whitney is unable to stop herself from blurting out her true feelings about him. Meanwhile, Lily plans a secret date to the grocery store for Roxanne and Mark in hopes of bringing them closer together. Just when it seems to be a bust, Roxanne surprises everyone.
When Whitney's father comes for a visit and gives her ,000, she believes he has finally changed for the better. Although Alex encourages her to use the money to rent an art gallery to display her photos, Whitney instead gives the money to Lily who is desperately short on cash. Later, the money trail continues when Lily entrust Roxanne to be the keeper of the 00 but Roxanne proves to be ill prepared for the job.
When R.J. and Alex reminisce about their former motorcycle days, Alex tries to bring the past back to life. Whitney, not as enthused, demands that Alex not get a motorcycle. Meanwhile, without Mark's approval, Lily decides to order new beer for the bar, benefiting everyone in the end.
Whitney can't hold back her excitement at the opportunity to reconnect with her half-sister, but when the reason behind Danielle's (guest star Natasha Leggero) visit is revealed, Whitney realizes she must support her sibling's life-changing decision. Meanwhile, Alex and Mark try to cheer up a newly dumped and depressed R.J. after discovering him soaking in his bathtub.
Alex convinces Whitney to celebrate their honeymoon at his parent's lake house, but they are surprised to be greeted by Alex's troubled father upon arrival. Wayne (Guest star Dean Norris) reveals to Whitney that the picture perfect marriage between he and Alex's mother is not as great as everyone believes. In the meantime, Mark, Lily and Roxanne make themselves comfortable in Alex and Whitney's apartment and discover some weird habits their friends share.
Alex reacts strongly when Whitney takes a picture of her backside for a bar bet. When Whitney accuses him of being uptight, he tries to prove her wrong which ends in disaster. Meanwhile, Mark tries to find out what bothers R.J., and is surprised at what he learns.
Whitney begs Alex to hang out with Lily because she is in need of a male friend. Alex reluctantly agrees, but ends up thoroughly enjoying Lily's company. Meanwhile, to bring excitement back to Low Bar, Mark and R.J. start up a competitive game of darts. All goes well until Roxanne is accidentally struck in the back with a dart.
Whitney spots her psychiatrist, Dr. Price (Guest star Chelsea Handler), ferociously eating a birthday cake by herself. Whitney sees this as a red flag and meets with Dr. Price to get to the bottom of her issues. Meanwhile, R.J. sets Mark up on a date, causing Roxanne to admit her feelings for him.