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.

Liv, Maddie and the rest of the Rooney family are excited to start their new life in California. As the school year begins, the Rooney's cousin, Ruby, returns home from a summer trip. Excited to have "sort of" siblings, Ruby can't wait to finally be a sister but finds herself in the middle of a sister-fight between Liv and Maddie. Meanwhile, Joey and Parker attend their new Science and technology school and their experience is not what they expected.

Joey is nervous when he's invited to perform stand-up comedy at a local restaurant. Parker finds himself in a predicament.

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."

Liv tries to help her new co-star Josh feel more comfortable in Stevens Point while the rest of the school prepares for Cowbell Week, a Stevens Point tradition.

In the season three finale, Liv and Maddie get into a big disagreement while trying to figure out if they'll be together for the next four years or be going their separate ways.

Casting is underway for Liv's co-star in "Voltage" and some familiar faces show up for the auditions. Meanwhile, Karen arranges a "cleansing ceremony" for Maddie to help her let go of her feelings for Diggie.

Joey invites three girls over to watch the "Lover's Comet;" Grandma Janice presents Liv with an award but something seems off.

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.

Liv invites her “Voltage” director and crew over for the Rooney’s traditional Christmas Eve dinner but is forced to enlist Artie’s help to prepare the famed meal. Meanwhile, Maddie and Willow’s gift exchange takes a surprising turn.

Joey and Parker hold strong beliefs that the Voltage set is haunted; Josh finds an excuse to spend time with Maddie.

Maddie and Josh go on their first date. Liv and Holden try to help Parker pass his show choir class.

Maddie and Willow join in on the Senior Scare, in which high school seniors scare middle school students; Liv and Joey head to New York.

When Liv needs to learn French for an upcoming interview, her mom decides to immerse her in the language and culture. Meanwhile, Maddie is thinking about dating again.

"Voltage" is taking up all of Liv's time, but when The Dream is asked to reunite for a fundraiser, Liv is determined to make it happen. Meanwhile, Maddie tries to figure out where to go to college.

Maddie enlists Liv's help to build a giant Paulie Porcupine head for the Homecoming parade, but Joey and Parker accidentally destroy it while playing around with a stunt-prop from Liv's TV show, "Voltage."

Liv gets upset when an interview focuses on her appearance instead of her acting. She enlists her friend Kristen Bell to help her change the conversation. Meanwhile, Maddie must hunt down a lost library book or else she won't get her final grades.

When Parker gets bumped up a few grades, he starts attending high school with Liv, Maddie and Joey! The older siblings now have to deal with him being good at everything.

Liv is not too happy when Joey lands a part on “Voltage.” Meanwhile, when Karen finds out that Andie's dad, Mr. Bustamante, disapproves of Dump Truck, they team up to change his mind. Josh has been really depressed since his split with Maddie and Liv realizes having Joey around cheers Josh up so gets him a small role in Voltage, but he takes it too far.

When Willow earns a scholarship that Maddie really wanted, the besties get into a huge fight. Then, when Joey accidentally breaks Liv's toe and tries to make things better, he ends up making it even worse.

A new coach arrives to take charge of the girls' basketball team and immediately butts heads with Maddie. Meanwhile, when Liv agrees to help Parker with his art project, her date with Holden takes an unexpected turn.

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.

Maddie is named captain of the girls' basketball team just as the school principal announces he is cutting funding for the program. Determined to change his mind, Maddie voices her concern to the principal, only to realize her team has abandoned her. Frustrated with her lack of leadership skills, Maddie turns to Liv to help her earn the team's respect. Meanwhile, Parker and Joey are challenged trying to find a bevy of tarantulas that escaped after Parker brought them home from school unbeknownst to their mom.

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.