A doctor's Halloween house call is anything but ordinary when it is revealed that Mel was once a teenage witch and her help is needed in a battle against an evil foe.
New couple Mel and Joe have a disagreement over whose family ornament gets to adorn the top of their Christmas tree.
When their honeymoon to Tahiti gets canceled due to Mel's broken leg, Joe surprises her with a cabin getaway. But their dream vacation quickly becomes a nightmare. Meanwhile, Lennox tries to hide her relationship with Marco.
Dani wants to go on a date with a boy at school, but Joe tells her she’s too young. So she tricks Mel into taking her anyway, putting Mel in the awkward situation of wanting to be the cool stepmom but having to lie to Joe. Meanwhile, Lennox and Marco run into Zander and are outed as a couple.
Joe wants Mel to stop taking birth control so they can start a family, but she's unsure. So he invites Nate and Gillian over with their new baby to see if he can change her mind. Meanwhile, Lennox tries to help Zander move on by setting him up with her friend Lilah, and Ryder announces his unexpected plans for the future.
It's Ryder's 18th birthday, and the family gathers to video chat with him, but the computer crashes before they get a chance to talk. Joe insists he can fix it, but Mel is afraid they'll run out of time, so she secretly hires a Jiffy Nerd computer technician behind Joe's back.
Mel and Joe write their thank you cards to everyone who sent them a wedding gift. Mel goes overboard thanking her Aunt Bunny and Uncle Bert for a huge cappuccino machine she and Joe actually hate. She has Joe return the machine to the store, but then gets notice that Bunny and Bert are on their way to visit the newlyweds. Meanwhile, Marco gets an offer he can't refuse.
Mel discovers Dani is something of a musical prodigy and gets her a piano to foster Dani's dreams. But she's caught off guard to find Joe opposed to it, until she uncovers his secret musical past in a boy band. This episode features Joey Lawrence singing "911." Meanwhile, Lennox pressures Zander to choose between working on "Cassandra: The Movie" with her, or continuing a relationship with his possessive girlfriend, Lilah.
Joe, wanting the family to spend more time with each other, puts a ban on cell phones and computers all weekend long. But it may come back to haunt him when he's offered a job if he gets back to the guy in time.
Joe is shocked to learn that Dani snuck friends in to the house, drank wine and then lied about it. Meanwhile, Mel is less than thrilled over Lennox's infatuation with her professor, who's proving to be a formidable rival for Lennox's attention.
Lennox wishes to follow her professor to Colombia; Joe wants Dani to tell her mother about her irresponsible behavior.
Mel and Joe decide they are ready to get pregnant right away. So they take the advice of multiple people on the best way to make that happen. Will all of their hard work result in a baby Longo? Plus, Ryder's back home from AmeriCorps and trying to determine what to do with his life. Lennox gives him some advice that leads to a surprising decision.
Mel & Joe are reeling from both the pregnancy test results and Ryder's announcement that he's joining the Navy. Feeling Ryder is completely unprepared, they hatch a plan to have Joe put him through a rigorous mock Boot Camp.
When Joe learns the significance of the little devil tattoo on Mel's backside, it's a big turnoff for him in the bedroom. Meanwhile, Lennox and Zander are forced to work with an untrained actress on their "Cassandra" short film.
Mel is thrilled when Noelle Devereaux, bestselling author of the steamy novel "Love and Bondage," pays a visit to her book club. When Nicole overhears Joe criticize her work, it turns her on, and she ends up trying to seduce him. Meanwhile, Lennox discovers Zander and McKenna are secretly dating.
After taking a new job with crazy hours, Joe has to down a bunch of energy drinks to stay awake for a meeting Mel has with Hank, a rich backer who might finance her Congressional run. But with Joe wired and acting weird, Hank fears he's is on drugs. Meanwhile, Lennox decides to kill off Cassandra to break up Zander and McKenna.
Mel tries to convince Joe to talk Gloria into drawing up a will, but Joe chickens out. So Mel invites Russell to come talk to her. Gloria is offended, but Russell soon charms her - a little too well for Mel's liking. Meanwhile, Lennox and Zander try to just be "friends with benefits."
Mel and Joe get stuck in a ski avalanche and are frozen for 100 years. When they thaw, they head to their home to find 120-year-old Lennox and Zander married. Mel and Joe want to resume their lives but discover the Big Brother government won't let them stay married and has already picked out the "perfect" new mates for them.
Mel pretends to love her birthday gift from Joe. But that turns out to be a fake gift to throw her off. Instead, he had a one-of-a-kind wedding ring made for her that she hates even more and is horrified she has to wear the rest of her life.
With Ryder home on leave, Mel decides to bring back Family Game Night, pitting her and Joe against Lennox and Zander. The competition sends them down memory lane, reminiscing their time together.
Mel decides to run on a Healthy Diet campaign for her senate run, but is then caught eating a Piggy Burger by a voter. After he tweets a photo of her and calls her a hypocrite, she gets into a war of the words with him. Meanwhile, Lennox invites Zander to move in with her after his roommates kick him out, but their love nest quickly turns into a house of horror.
In the series finale, Mel receives unexpected news as she prepares for her senate campaign. Meanwhile, Ryder finds out where the Navy is sending him; and Lennox and Zander both have wake-up calls after they survive a bad car crash.