When Shelby's adventurous Grandma Rita comes to visit, the girls learn time travelers were responsible for setting up Shelby's grandparents and they jump to the 1950s to investigate.
The girls discover that their future-selves have asked to lose their time traveling abilities; they leap ahead to see that Janet Smythe is involved; Barry learns that Marci is planning to dump him.
Cyd and Shelby take Daisy out to the mall for an 'epic girls day'. But when they accidentally jump back to the past, they see a mysterious figure who could have something to do with Daisy's imprisoning.
When Barry is too busy to help Shelby build her new website, Shelby must take matters into her own hands. Meanwhile, Cyd and Naldo win a boat and try to hide the huge cruiser in the backyard.
When Shelby and Barry compete against each other to have their latest innovations win at the Dax Fraggins Tech Pitch Fair, the aspiring scientist's ego causes him to be a jerk to fellow contestants and even his friends.
When Daisy reveals that she's engaged to Sebastian, a young man she's never met, Cyd and Shelby decide to travel to the 16th century to help her break off the engagement.