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There is no Next Episode of Best Friends Whenever planned.
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.
Cyd and Shelby have trouble studying for an upcoming history test and try to jump ahead in time to steal the test questions; Barry and Naldo try to replicate time travel.
Cyd wants to plan a special thank you for the Marcus family; Shelby tries to help but everything leads to a misunderstanding and a kitchen disaster.
When Cyd and Shelby revisit their favorite memory from middle school, they're shocked to find that the moment wasn't the same as they remembered.
When Shelby's new lab partner, The Rob, can't stop being mean and annoying, the girls travel back in time to try and find out why he's such a jerk.
Cyd and Shelby go back to change the past so that Barry can meet his childhood science hero. However, when they return, they realize Barry and Naldo have changed as well and are now terrible rock musicians instead of aspiring scientists.
When the girls are assigned to do a report on the 1970s disco era, they decide to travel back and experience the 70s firsthand and land in the midst of turf battle between the disco and punk kids.
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.
Cyd and Shelby use Barry's new invention to teleport themselves to New York City's Spooktacular in Central Park and get trapped in a haunted house with Riley and Lucas from "Girl Meets World."
When Cyd and Shelby go back to kindergarten to celebrate their friendship anniversary and relive the day they first met, they begin to change back to their five-year-old selves.
The girls go back in time to stop GDD CEO Janet Smythe from starting the corporation, when they learn she is behind the future lab. But their plan prevents other major events from happening in their lives, including them living together, and Barry and Marci falling for each other.
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.
Shelby and Cyd try to use time travel to attend two events on the same night but the plan backfires when they both meet boys they like at each event!.
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 Diesel accidentally swallows a time travel tracker and disappears, Cyd and Shelby must track him down before he's lost forever.
When the girls discover their future-selves have asked to lose their time travel abilities, they leap to the future and see that evil Janet Smythe is somehow involved. Meanwhile, Barry learns Marci is planning to break up with him.
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!