On the Mooncliff Mountains, Skylar is telling Nico, Ciela, and Avion about the time Shuriki invaded the Kingdom of Avalor, and how a year ago, Elena drove her out, with Elena and Mateo watching. Skylar also tells his trainees that keeping Shuriki out of Avalor and then driving her out was supposed to be the Guardians of Avalor's job and how they've always been ashamed that they couldn't do it. Skylar explains to his trainees that because of this, the Guardians of Avalor need to be smarter, stronger, and faster in order to keep history from repeating itself. With the story concluded, Chief Zephyr tells the trainees that the next day they will take their Guardian Test: If they pass, they will become Guardians of Avalor, but if they fail, they will be sent back to Vallaestrella. Mateo reminds Elena of the state of the kingdom address she has to give the next day to the Grand Council, and should therefore head back to Avalor Palace. Nearby, Victor Delgado and Carla are plotting their revenge on all of Avalor for their previous defeat by Elena and her family.
The next day at Avalor Palace, Elena gives her state of the kingdom address to the Grand Council of Avalor where she outlines how great her first year as Ruler has been. The Grand Council agrees that it's been a great year and awards her a Medal of Honor for all she's done for Avalor. Elena gratefully accepts the Medal and declares she got being Ruler down. Francisco reminds her that she still has more to learn before she'll be ready for the moment she becomes Queen three years from now. Elena disagrees and ticks off her numerous acts of heroism. After taking the Scepter of Light from Armando, Elena hops on Luna and flies off to watch Skylar's trainees take their test.
Elena and Luna arrives at Mooncliff Mountian in time for the Guardian Test. Chief Zephyr explains that the Guardian Test will test their reflexes, strength, agility, and intelligence. To make the test harder than ever, Migs and Mateo designed the Test for this year. Migs explains to the trainees the Test is divided into two parts: First is the Battle Test where they will face a magical enemy that Mateo prepared which they must defeat without getting zapped and second is the Search and Rescue Test whre they have to find three statuettes that Mateo hid in Via Mercado and bring them back to the pedisal within ten minites. The Guardian Test begins with the Battle Test. For the Test, Mateo has conjured up Orizaba as the magical enemy. Working together, Nico, Ciela, and Avion defeat Orizaba and passes the first part. Mateo conjures up a magical hourglass and the second part starts. The trainees have trouble finding the statuettes until Nico reveals that they are invisible. They successfully find all three statuettes and head back with them. Avion and Ciela safely deliver theirs but Victor hits Nico's with a slingshot, causing it to shatter. Because of this, Chief Zephyr passes Avion and Ciela but fails Nico to which Skylar sadly escorts his little brother back to Vallestrella. Nearby, Victor and Carla follow the Jaquin Brothers to the gateway since what they seek is in Vallestrella. Meanwhile, Elena protests failing Nico insisting he be given a second chance and Ciela and Avion agree with her stating it was because of Nico that they passed. Migs tells them he can't be given another chance as it's against the rules laid down by Skylar and Nico's father King Verago. Elena decides to go talk to him despite Migs and Mateo being against it since humans aren't allowed in Vallestrella and enters the Gateway on Luna, unaware that Victor and Carla have followed them inside.
Elena and Luna arrive in Vallestrella and meet up with Skylar and Nico. Migs and Mateo appear and urge her to head back but Elena remains adamant that she meet Verago. Meanwhile, Carla and Victor set off to find Marimonda, a wicked forest spirte whose hope they plan to enlist for helping them take over Avalor, using a map that was given to Victor by an old friend of his. Meanwhile, Elena's group meets King Verago, who isn't pleased to see humans in Vallestrella. Elena asks him to allow Nico to retake his Guardian Test but Verago refuses and esplains why the Jaquin Rules are important. For example, he tells Elena that the reason humans are not allowed in Vallestrella is because years ago human accidently released Kizin, an evil monster the Jaquins had their biggest battle against, and their are other dark forces imprisoned in Vallestrella. Elena tells Verago she understands and sadly tells Nico he won't get a retest.
Meanwhile, Victor and Carla have arrived at the spot where Marimonda is imprisoned. Using the map, they pull out the right magical jewel and free the forest sprite. They tell her how urban Avalor has become and that she'll need to capture a Jaquin to open the gate and the sprite sets out to cover Avalor in vines. Elsewhre, the others are alerted to Marimonda's escape. Verago informs Elena that Marimonda is a evil forest sprite who tried to destroy every city in Avalor centeries ago but was stopped by the sun birds by ancient magic. Verago sets out with Migs to trap the spirite. Skylar tells Elena about Quita Moz, a sun bird oracle who can help them stop Marimonda. The group goes to the spot where the nest is rumored to be and find it with the Scepter. After being cut off from the others, Elena meets Quita Moz, who teaches her how to use the Scepter's illusion creating ability and gives her a magical jar to reimprison Marimonda. Meanwhile, Verago has set a trap for Marimonda with Migs as the bait. Elena's group arrives and, thinking Migs is in trouble, accidently ruins the trap. Marimonda traps Migs and moves out with him. Elena and Skylar give chase but Marimonda traps them in vines and escapes.
After they break free, Elena and Skylar decide to set a trap for her by using the Scepter to create an illusion of a house. However, Victor and Carla wreck the trap and reveal that they are behind it all. Marimonda uses Migs to open the gate and the three of them go back to Avalor. Verago accuses Elena of bring ruin to Avalor but Skylar defends her. The group goes back to Avalor and after a long struggle successfully traps Marimonda inside the jar. Verago declares Nico a Guardian of Avalor and the group goes back to Vallestrella. Once there, Elena gives the jar to Quita Moz, who warns her of a darkness she must overcome or she'll never become Queen of Avalor. The darness is revealed when Victor and Carla give the jewel they took to his old friend: Shuriki. Shuriki uses the jewel's magic to restore her youth and promises to make the pair malvagos so they can conquer Avalor together.
- Aimee Carrero as Princess Elena
- Lou Diamond Phillips as Victor Delgado
- Myrna Velasco as Carla Delgado
- Cheech Marin as Quita Moz 
- Noël Wells as Marimonda
- Jane Fonda as Shuriki
- Carlos Alazraqui as Skylar
- Jess Harnell as Chief Zephyr
- Jillian Rose Reed as Naomi Turner
- Emiliano Díez as Francisco
- TBA as King Verago
- Chris Parnell as Migs
- Jenna Lea Rosen as Ciela
- Yvette Nicole Brown as Luna
- Lincoln Melcher as Avión
- Wilber Zaldivar as Nico
- This was supposed to be the season finale for Season 1, but got replaced with "Party of a Lifetime".
- Shuriki will reprise her role in the special.
- Victor and Carla also reprise their roles.
The image gallery for Realm of the Jaquins may be viewed here.