When Polly Pocket discovers the magical power of her grandma Penelope's locket of shrinking any object or person down to pocket size, Grandma explains its power and hopes Polly will use it for good.
As Melody and Polly get captured by the Grandes in exchange for the locket, and get late for Molly's show, Shani is forced to take her place.
Polly, along with her friends, runs to warn the employees at the park that the roller coaster will break after they create a miniature one at home and know its weak part.
Lila asks Polly and Shani for help when she finds herself in trouble after starting a dog walking service.
Polly learns a valuable lesson when Shani finds a baby bird and nurses it back to health.
As Polly wants to prove herself to her parents, she asks to babysit her baby brother Paxton while they are away. Despite this, it ends with the girls chasing Paxton after shrinking him down with them.
Polly falls asleep and loses her locket after being exhausted from her long to-do list of helping the people of Littleton.
Mr. Pocket misplaces the ring when the Pocket family heads out for the beach to celebrate their anniversary forcing Polly and her friends to use her new sub and search for it.
While at Girl Scouts camp, the girls are trapped in a doll-size when Griselle and Gwen steal the locket.
Griselle disguises herself as a candidate for the town's new mayor and tricks the girls into setting up their dance at city hall.
As Polly exposes her secret to Nicolas when she asks him for help to defeat Griselle, he becomes one of her pals.
Polly and her pals must save the day when they find an actress has been abducted.
In order to attract members to their Animal Club, the girls use their skills to bring real wild animals in. However, Polly has to find her new miniature animals when they run off before they stay tiny forever.
Polly realizes that family is more important than looking cool when she tries to be in two commitments, her pool party and helping her father, at once.
As Polly, Lila, Shani, and Nicholas fake a ghost attack when plans to make a new movie clash, Pierce is forced to call in a paranormal investigator.
After Shani throws her own model rocket into the trash, believing that Polly's using her locket's magic to win the science fair, the girls have to team up and save it without being caught by the Grandes.
During Spring Break, the girls split up to spend their vacation. As Polly and Grandma Penelope go skiing, the Grandes go in disguise and try to snatch the locket from Polly.
Polly and her friends are excited for Halloween until they run into Griselle and Gwen in Haunted Hayride.
Polly and Shani are irritated when Lila starts to forget about helping in their school's food drive as she tries to imitate a teen social media celebrity who likes her fashion designs.
Polly and her friends challenge Skate King Devon and his crew in a skate competition in order to make the big bowl at the skate park available to anyone.
While trying Polly's new miniature yacht, Nicolas and Shani discover something mysterious about the island, the locket stops working for an unknown reason.
Tiny-sized Polly tries to save her pocket-size friends when they are trapped in a pencil case inside a drawer and helps her teacher Miss Fuss.
Polly goes on a mission to find her mom's phone with Grandma Penelope's help when she loses it during a day at the spa.
The girls secretly decide to try to help Gwen when they notice her lack of confidence by letting her find something she is good at.
While Polly goes to Grandma Penelope for help when something goes wrong with the locket, her friends find out about the Pockite crystal which gives the locket its powers.
Penelope sacrifices herself while Polly and her friends reach the Pockite cave to recharge the locket and discover an unexpected frozen person.