Cyd and Shelby discover a major clue to the future lab memory and it is somehow tied to Barry's Science mentor Janet Smythe, who also employs Shelby's dad.

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Cyd and Shelby use time travel to attend two different events on the same night; the plan backfires when they meet boys at both events.

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.

When the girls travel back to the 70's for help on a report, they land right in the middle of a turf battle between punk and disco kids.

When the girls discover inventor and GDD CEO Janet Smythe is behind the future lab, they decide to fight back and travel to the past to stop Janet from starting the corporation. Their plan seems to work until they realize they also stopped other major events from happening in their lives, including them living together and Barry and Marci falling for each other.

Bret and Chet worry about their sixth grade dance; haunted by the nemories of their own experience, Cyd and Shelby go back in time for a do-over.

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When Janet unexpectedly invites herself over to Shelby's for dinner, the girls use the opportunity to find out what she knows about time travel.

While Janet tries to uncover the secret behind time travel, the girls decide they need to take her down once and for all!

Cyd and Shelby watch roller derby against Astrid's wishes; they find out Shelby's mom has been lying.

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A princess named Daisy has come through the time rift from the 16th century and finds herself at Cyd and Shelby's school.

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When Cyd and Shelby attempt to change the past so that Barry can meet his childhood science hero, they travel to a period where Naldo and Barry are rock musicians instead of scientists.

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The girls decide to take Daisy on an official "Epic Girl's Day" at the mall since she might be here longer than expected.

Barry is too busy to help Shelby build her website so she takes matters in to her own hands; Cyd and Naldo win a boat and try to hide it in the backyard.

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Things spin out of control when Cyd travels back to Christmas the year before to try and figure out the perfect gift for Shelby. Meanwhile, Barry and Naldo's Winter Wonderland experiment sparks an elf war with Bret and Chet leading the charge.

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Shelby and Cyd get their first jobs at a fudge kiosk at the mall, but the job is not all that Shelby thought it would be.

When Cyd tries to plan a special thank you for the Marcus family, Shelby steps in to help with hulu dancers, a rock band and jugglers and everything somehow leads to a big misunderstanding and a huge kitchen disaster.

Diesel swallows a time travel tracker and disappears; Shelby and Cyd hurry to track him down before he's lost forever.