Best friends Shelby and Cyd gain the unpredictable power to travel back and forth in time when one of their friend Barry's science inventions goes awry. With their newfound power, the teen besties try to fix the mishaps that spoiled Shelby's plans to ask her crush Cameron out to the school dance.

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.

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.

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 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!

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

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

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