The people in Rainbow World need help, they’ve lost their sparkle! Best friends Bella, Ruby, Poppy, Sunny, Jade, Skyler, Violet, and Amaya have been chosen by Ms. Morton for a very important mission! But before they can help, there is so much for them to learn about Rainbow World. What is a Portal? How do you open a crystal? What adorable pet will they get? What’s at the end of the rainbow? Can they figure it out, or will they give up trying?

The girls are having fun getting to know their pets and are ready for their first lesson: learning how to create liquid rainbow portals! This all comes easy to Bella! She's excited and wants to make a portal right away! But Jade reminds her that she doesn't know everything yet. Will Bella listen to her bestie or try it before she's ready?

It's time to use their new skills to help the people of Rainbow World find their inner sparkle! Sunny and Skyler are teaming up to help Kira, who just moved to a new town and is getting ready for her first day of school. But she can't decide what to wear, because she's worried about what everyone will think of her. Luckily, new Shimmers Sunny and Skyler are here to remind her to be herself and find an outfit that lets her true colors shine!

Welcome to Moonbow Beach! The Rainbow High Shimmers are headed to the beach to get to know Rainbow World, and get to know everyone in it, better! After learning so much about liquid rainbows and portal jumping, these besties could use a day in the sun. Jade is ready for a fun day surfing the waves and flying high in a kite! But her monkey is scared of the water and wants to play on the shore instead. Will they find a way to have fun together?

Poppy and Amaya are portal-jumping to meet Princess Marina of Moonbow Kingdom. Marina wants to be the best princess she can be and help others shine, but doesn't know where to start because everything is always done for her! Luckily, the Shimmers are here to teach her that she can do things on her own and if she follows her heart, she will make herself, and others happy!

We're going back to Junior High! When Violet creates the perfect shade of purple for her sparkle glow, it brings back a memory of when she used to paint in Junior High and created the perfect purple! For Sunny, it's not a happy memory because she thinks she's the reason Violet stopped painting! But she has an idea: they can time travel back to Junior High and stop younger Sunny from throwing away Violet's paint! Violet doesn't want to mess with the past, but Sunny is determined to fix her biggest mistake!

Ruby is heading to Moonbow Kingdom to help Rosetta, who is having trouble with her designs for the Kingdom’s winter outfits. Rosetta is confident she doesn't need help, until she finds out that Ruby knows Jewel Richie, her biggest inspiration! Ruby believes Jewel can help them, so they portal jump back to Rainbow High to find her. Can Jewel help inspire Rosetta to finish her designs?

Oh no! Rainbow World is losing its sparkle! To find out why, the Shimmers go to Moonbow Beach! When they arrive, they find the Unicorn is destroying everything. Can the Shimmers work together to help Rainbow World get its sparkle back?

Like their big sisters, Daisy and Amethyst are besties, and love to play pranks together! The two say they have a big surprise planned, but Sunny and Violet are worried they will spoil the talent show. What surprise could they have for their big sisters?

All the Rainbow High girls are having fun hanging out with their little sisters, except Amaya. Opal is a bookworm and really wants to finish her favorite book before practicing for the talent show with her big sister Amaya. Will they make it to the talent show?

The pets are enjoying a sparkly spa day when suddenly, everything loses its color! To find out why, the Shimmers and their pets portal jump to the beginning of the rainbow. But they must be careful because the pets have the last liquid rainbow in all of Rainbow World. So if they can't fix it, they can't get home! Can the pets work together to solve the problem and bring color back to Rainbow World?

It's Kira's birthday, and the girls are portal-jumping to a winter wonderland, ready to celebrate her special day! But when they arrive, they find Kira stuck in a tower! She tried to make the snow extra sparkly with sparkle glow, but instead, she brought the snowmen to life! Now, they won't let Kira out or anyone else in. Can the Shimmers work together to bring Kira down and celebrate her birthday?

Sunny has an amazing discovery while portal jumping through Rainbow World: she can collect liquid rainbow and use it to color and create new outfits! She wants everyone to try, but it’s almost time for the Color Block Party, and they need to get back to Rainbow High. Poppy and Ruby decide to stay in the portal with Sunny, and they’re having so much fun creating new, colorful looks! But oh no! The rainbow portal is starting to close! Will the girls find a way out and join their friends for the party?