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.

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.

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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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.

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

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!

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.

Shelby and Cyd encourage a homesick Daisy to incorporate a festive 16th-century tradition into their annual Christmas party.