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."

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.

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.

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 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.

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's new show is in danger of being canceled because they can't find the right cast; Liv helps by searching for the perfect star; Parker plans to take Joey and his new Falcon persona down by having Joey test-drive a dangerous invention.

Liv has a sleepover to help Ruby and her co-star Priya become better friends; Joey meets a new nemesis and Parker reveals a big surprise to Maddie.

As the cast of "Sing it Live!!!” gets ready for a live televised show, a vocal injury threatens to ruin Liv's performance.