The story happened a year after Frozen 2 . After experiencing self-exploration and searching for the truth of magic power, Elsa finally found her self-worth, became the fifth spirit and put down the status of Queen Ellendale! Freely live with other spirits and Northuldra tribe in the Northern Forest.

Anna and Kristoff are about to get married. Peoples are busy building wedding venues. The entire kingdom and people are immersed in a happy atmosphere!However, the Queen's husband, Kristoff, was still unable to adapt to the tedious rules of the wedding. Queen Anna is gradually familiar with national affairs, and she is also looking forward to and nervous about the wedding.

At this time, the horn sounded outside the palace. It turned out that Elsa, who lives in the northern forest, rode the water spirit-Nokk elves back to spend family weekends with Anna and friends! Anna ran out of the palace excitedly to welcome her sister Elsa!

In the evening, Anna, Elsa, Kristoff and Olaf had dinner. Olaf is still showing his removable body parts to entertain everyone. At this moment, the palace minister hurriedly opened the door to disturb them. The letter stated that someone had seen King Agnarr and Queen Iduna on an island in the South Sea. Anna&Kristoff and Elsa decided to postpone their marriage and set out to find their parents!

The next day, Anna, Kristoff, Elsa and Olaf were ready to board and set off for the South Sea. Anna entrusted the kingdom to the palace minister.

At this point, the troll elder Grand Pabbie rushed over and said that he foresaw that their trip would be full of danger, and this trip would change some people and things!

At this time, a spy hiding in Arendelle saw Queen Anna's ship leaving the port and wrote to Hans, telling Hans that Anna and Elsa were not in the kingdom at the moment!

The long voyage and hot southern climate made Anna and her partners uncomfortable. At this time, Olaf said that he seemed to have a fever, and there was a fire burning in his head and chest! Anna and Elsa are discussing how parents haven't been through these years? Soon, they finally reached the island!

This is a tropical island with huge active volcanoes and dense and Elsa started looking for parents. At this time, Olaf did not notice the trap on the ground due to fever and discomfort, resulting in everyone being trapped by the trap.

They were arrested by the island's indigenous, who were taken to the tribe at the foot of the volcano. The elders of indigenous say they don't welcome outsiders and ask them to leave the island immediately!

At this time, sudden activity inside the volcano caused magma to flow to the tribe's location. Seeing that the magma was about to destroy the tribe, Elsa immediately used magic to create a thick wall of ice, forcing the magma to flow elsewhere to save the tribe. Then the tribal people finally accepted them! Anna asked if they had met their parents. Elder indigenous said that the tribe's people did see two foreigner on the other side of the island when they went hunting, so Anna and partners decided to go to the other side of the island!

At this point, Olaf fainted, and Elsa said that the power inside Olaf seemed to lose some balance, and they didn't know what to do! Indigenous elders tell them that there is a hot spring on the way to the other side of the island, and the hot spring has magical powers to heal all injuries and sicks. They can go there and see, so they decided to speed it up!

At this time,in Arendelle kingdom

The port sentry discovered that many armed ships appeared on the sea not far from Arendelle. The leader of the fleet was Hans!

It turned out that Hans met a powerful magician when he returned to the kingdom . He helped Hans defeat his brother to ascend the throne. Hans knew that Anna and Elsa were temporarily out of the Arendelle kingdom, so he decided to take this opportunity to attack the weak kingdom Arundel. . The Kingdom of Arendelle was soon occupied, some were arrested, and some fled to the northern forest where Northuldra tribe was located. Elder Northuldra Yelena wrote a letter and commissioned wind spirit -Gal to send the message to Anna. She led the tribal people to work with General Matthias' forces to protect the people and the forest.

Anna & Elsa & Kristoff & Olaf finally reached the hot spring at the foot of the volcano. But then, the volcano reactivated and triggered an earthquake. Many stones fell off. Anna saw that Elsa was about to be hit by a boulder, so she pushed Elsa away and caused herself to be smashed by the boulder. Elsa, Kristoff, Olaf were very sad, so they decided to let Anna and Olaf soak in the hot spring together!As a result, Anna was resurrected and Olaf was back to health!

They finally reached the other side of the island!They found a wooden house near the coast. There are signs of use in the house. The sisters also found their pictures in the room!

At this time,someone stunned them from behind ! They woke up and found themselves tied up. At this time, the attackers appeared, The attackers were their parents, King Agnarr and Queen Iduna.

At first, they did not believe that the person in front of them was their daughter. Until Anna and Elsa started singing their mother's lullaby "everything was found", they finally believed that Anna & Elsa was their daughters!The family is finally reunited!

It turned out that when the king and queen fell into the sea, they encountered an ocean current sailing south and drifted to an island in the south. However, frequent volcanoes and earthquakes on the island, coupled with the fact that local indigenous people do not welcome foreigners, make it difficult for ships to enter. So they were not rescued until now! Fortunately, the supplies on the boat also drifted with them to the island, so they were able to survive to this day!

At this time, the wind spirit-Gal finally brought the information to knew what was happening in Arendelle and decided to return to Arendelle immediately. With the help of the water spirit-Nokk, they returned to Arendelle as quickly as possible. A group of people first bypassed the kingdom pier and went directly to the northern forest to meet everyone!

After they reached the forest to meet everyone, they decided to fight Hans and regain their own home. Elsa pleaded with 4spirits to help her sister save the Arendelle kingdom. 4spirits remembers Anna's past destruction of the dam and the liberation of the forest. So they decided to help, so Arendelle's army + Northuldra tribe + 4spirits was ready to fight Hans and his army!

(War begins)

Elsa-Use Ice Magic

Anna-Sword + Shield (Traditional Weapon)

Kristof-Commanding Reindeer Attack

Olaf-Commanding Little Snowman and Big Snowman Attack

Earth spirit-Throwing Stone

Water Spirit-Destroy enemy's ships with water

Fire Spirit-use firepower to attack the enemy

Wind Spirit-torn up the enemy with a tornado

Hans has a powerful magician here. His power is stronger than Elsa, so Elsa cannot easily deal with them!When Elsa's magic was about to be suppressed by the enemy's magic, Anna accidentally used magic, it was fire magical power!

It turned out that the spring water in the hot spring unexpectedly awakened the sleeping magical power in Anna's body!

At this time, Elsa finally understood that! Olaf was co-created by her and Anna in childhood, and its body carried half of her and Anna's strength and spirit!This is balance! Ice and fire balance!

Therefore, Elsa & Anna, the perfect combination of ice and fire, defeated the magician of Hans!

Hans' army was completely defeated!

The ending of the movie is the grand wedding of Anna and Christopher. Anna and Elsa also invited the Northuldra tribe and 4 spirits to the wedding!

King Agnarr and Queen Iduna abdicated, and lived a leisurely life somewhere between the kingdom and the forest!

Post-credits scene is Anna whispering in the ears of Kristoff and Elsa at the wedding dinner. Kristoff jumped up happily while Elsa hugged Anna excitedly and said, "I'm looking forward to their arrival!" It seems to indicate that Anna is pregnant!