Twin sisters Liv and Maddie finally reunite when Liv returns home to Wisconsin after starring for four years in a hit musical television show in Hollywood. The Rooney sisters quickly realize their polar opposite personalities put their unbreakable twin bond to the test. While their parents play referee between Liv, a cool, confident, social butterfly who loves to sing, and Maddie, a smart, athletic, high school basketball star who opts for high tops over high heels, brothers Joey and Parker seize the opportunity to capitalize on the chaos and get away with as much as they can.

When Joey is too nervous to talk to the new girl who he likes, Maddie decides the best place for him to practice talking to girls is at the high school dance–when everyone is in costume. Meanwhile, Parker booby-traps the house to protect one of the family’s most prized Halloween decorations from being stolen.

When Liv decides to volunteer at the senior center where Maddie works, chaos ensues and the seniors get the girls involved in a rowdy game of dodge ball to claim their turf.

Liv and Maddie try to plan their sweet 16 party but complications arise.

When Maddie fails her driving test and Liv needs help trying to get a part in a sci-fi play, they decide to switch so Liv takes Maddie's driving test and Maddie auditions for Liv. But when Maddie accidentally yells, "Bam! What!?" Joey and Parker realize it's her and not really Liv, and Liv wrecks the car during Maddie's driving test.

Maddie and Pete sign up in a basketball Tournament.

When the kids overhear their parents' conversation, they mistakenly believe they are moving.

In an effort to help Maddie bring out her “girly side,” Liv gives her a pair of the most comfortable high heels ever made.

Liv is told that the coveted role of Tristan in “Space Werewolves” has been narrowed down to herself and two other famous actors.

Maddie anxiously waits for a letter from the Junior Olympics to arrive to find out if she is invited to try out for the basketball team.

Maddie gets jealous when Liv's best friend from Hollywood visits and flirts with Diggie.

Liv's new music team makes a big mistake that causes her latest single to become a viral hit for all the wrong reasons.

To prove to the skeptics that she is meant to star in “Space Werewolves,” Liv agrees to do all her own stunts, not realizing exactly how complicated they are. Maddie tears her ACL and needs surgery, therefore not being able to play in the championship or go to the Junior Olympics.

In the season two premiere, the family is getting ready to compete against one another in the Wisconsin Cheddar-Brat Fest. Ironically, Liv’s premiere of “Space Werewolves” is on the same night.

Liv co-hosts and performs at a New Year's Eve party and when a secret is revealed on live TV, it causes Maddie to question her long distance relationship with Diggie.

Liv meddles with Diggie's "meet-a-versary" gift for Maddie and Parker concocts a new face cream for Karen.

Diggie returns from Tundrabania, but he and Maddie have trouble reconnecting. Joey tries to solidify his relationship with Diggie through the Tundrabanian sport of Flugelball. Meanwhile, Parker attempts to teach his new unlikely friend Dump Truck how to ride a bike.

Liv and her band mates are stumped and can't agree on a theme for their new music video. They enlist Parker to shoot the video with his new camera and Diggie enthusiastically signs on to join his crew.

Ridgewood’s mascot has been vandalized, and the Rooney’s all become suspects. Meanwhile, Parker has the day off from school and gets into trouble at home with Reggie.

Maddie and Diggie try to "out-fun" each other at a local music festival as Liv tries to help Andie get over her breakup.

Before he leaves for Australia, Diggie needs to tell Maddie how he feels. Meanwhile, Parker, Reggie and Evan swear they will remain on the couch until the new season of Linda and Heather is released.

While Joey and Maddie try to catch Diggie before he departs for Australia, Liv covers for Maddie at home. But when Diggie shows up at the Rooney house, chaos ensues, reminding Parker of his favorite soap opera drama. Meanwhile, Liv gets a call from her manager telling her she landed a coveted role in a new TV show "Voltage."

A reporter mistakes Maddie for Liv while she's on a date with Josh. Maddie doesn't want Diggie to hear the news from the press, so she asks Liv to play along.

With Diggie’s return, Maddie is torn between him and Josh. Meanwhile, Liv is asked to plan a wedding in under a week when Gemma and Johnny Nimbus decide to get married.

Liv realizes that Voltage is moving their set to Los Angeles and she must pick to either move to California with the show or stay home and go to college with Maddie. Joey finally realizes that he likes Willow back and he needs to tell her this before she leaves to California for training camp.

Maddie is upset that she can’t be in Wisconsin for Christmas and to cheer her up, Liv plans an incredible surprise. Meanwhile, Joey participates in a Mr. North Pole Santa Claus pageant against an old foe and Parker tries to teach Ruby the wonders of a Snow Day.

After exciting opportunities arise for each of the Rooney children, their summer plans are thrown into jeopardy.