The exploits of identical twins Liv, a former television star back home in Wisconsin and in the process of adding movie star to her credits, as well as beginning to focus on her music career, and Maddie, an outstanding student and basketball phenomenon recovering from an injured knee. The series centers on the unbreakable bond the twins share though they have wildly different personalities. To complicate their teenage lives, both parents work at their high school and their younger brothers are always stirring up trouble.
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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.
Ridgewood High is hosting the annual "Brain Olympics", and Joey is intent on forming a team in hopes of winning. Liv, in an effort to shed part of her girly image, convinces Joey to let her join the team. In competition, each team has to build a Rube Goldberg machine, but when Joey thinks she is not clever enough, Liv decides to build her own. Meanwhile, Maddie holds a yard sale to raise funds for the French Club's trip to Montreal, and a priceless childhood memory accidentally gets sold.
Liv and Maddie try to plan their sweet 16 party but complications arise.
The annual Stevens Point Holiday Spectacular is coming up, and Liv is asked to host the televised event. When Liv discovers the little girl she's asked to perform with shares the same strong desire for the spotlight, trouble ensues. Additionally, Pete and Maddie are in charge of decorating the city's Christmas tree, but the power goes out amid Liv's performance. Meanwhile, Parker swindles money from Joey while dressed as Santa and an elf in order to purchase an expensive present he suspects no one will gift him.
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.