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The girls go back in time to the 1970s to experience the disco era and become involved in a turf battle between disco and punk kids.
Shelby's adventurous Grandma Rita visits and the girls learn that time travelers set up Shelby's grandparents, so the girls jump to the 1950s to investigate.
Tyler enters the same art competition as Avery, and she accuses him of only doing it for the prize money.
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