Notes

After Jack was able to fix his staff and made his way back to Pitch's lair to rescue the fairies, but found out that they couldn't fly since there were only a few lights left on the Globe of Belief. Jack noticed that the last light was Jamie and he made his way back to Burgess, Russia to recruit Jamie. That night Jack rushed to Jamie's house to get him, since he's the last believer in the world, Jack finds him talking to his stuffed bunny asking him (Bunnymund) to give him a sign so he knows he's real. Jamie seems to start losing hope in the Guardians until Jack makes an egg with his ice powers in Jamie's window. Getting Jamie's attention, Jack makes a bunny and makes it come to life and jump around the room. Jamie gets excited and starts jumping in his bed until the bunny turns into snow, resulting in a snowflake to nip at his nose and for him to believe in Jack Frost. Jamie asked "Jack Frost?" which caused Jack to look at Jamie and wonder if Jamie believed it him.
When Jamie revealed he can see and hear him, Jack gets excited about having his first believer. When they hear North's sleigh, both of them rush outside. Jamie reveals that he can see Jack and the other Guardians. Bunnymund thanks Jack for making Jamie keep his belief in him. When Pitch appears, Jack goes to fight him, causing the other Guardians to lead Jamie away. Pitch being more powerful than before beats Jack and makes him fall to the alley where the others were. Pitch traps the Guardians and Jamie, Jamie tells Jack that he's scared. Hearing that, Jack gets a memory of the same thing his sister once said causing Jack to realize what his center is: Fun. Pitch approaches them but was hit by a snowball by Jack. Distracted, they escaped and went to gather up Jamie's friends. With the help from the other Guardians, Jamie's friends start to believe again.

Jack reassured Jamie to not be scared since the Nightmares are just bad dreams and Jamie volunteered to protect the Guardians causing his friends to join him. Pitch then sends a wave of nightmare sand their way but once Jamie says, "I do believe in you. I'm just not afraid of you!" Jamie was able to turn the nightmare sand back into Dreamsand. Which helps the Guardians get their full energy back and battle Pitch. North used his snow globes to bring his Yetis to help out while Bunnymund opened tunnels to get his Warrior Eggs to also help in the battle against the Nightmares while the Guardians confronted Pitch. Jamie gets an idea on how to revive the Sandman and told his friends about it. As the battle with Pitch continued, the Nightmare King was cornered by the Guardians, but hid in the shadows and appeared behind a distracted Jack with scythe created out of nightmare sand, but before he could hurt him, the Sandman returns at the last second saving Jack from Pitch and uses his sand to give everyone good dreams and make more believers. The Guardians and the children started celebrating and Jack hits Jamie with a snowball, which caused a friendly snowball fight. When Pitch woke up, he tried to make Jamie fear him again but found that Jamie was not scared of him anymore because he was able to pass through him. Pitch, afraid, retreats to his lair which caused the Guardians to follow and confront him one last time. After Pitch was taken away by his own Nightmare creatures, the Guardian ceremony was performed again. Jack looked at Jamie which caused him to nod. Proud of himself and of Jamie, Jack says, "I will," making him an official Guardian. "Then congratulations, Jack Frost, for you are forevermore...a Guardian." North closed the book. The kids cheered wildly. The yetis and the eggs celebrated. Amid all the celebrating, Jack noticed the Mini Fairies flitting about, swooning and fainting with joy. "Keep it together, girls," Tooth reminded them. Caleb pointed to something huge in the sky and Monty identified it as Santa's sleigh. After everything they'd seen, the kids still couldn't believe their eyes at the sight of the sleigh. "Everyone loves the sleigh," said Bunnymund, with North chuckling. Then North saw the sun rising higher in the sky. "Time to go," he told the Guardians. Sandy threw Dreamsand up into the air. It floated down softly and landed on Jamie and his friends, who began to yawn and stretch. "You're leaving?" Jamie asked drowsily. "But what if Pitch comes back? What if we stop believing again? If I can't see you..." Jack knelt down to look Jamie in the eye. "Hey, slow down, slow down! Are you telling me that you stop believing in the moon when the sun comes out?" "No," Jamie replied. "Okay, well, do you stop believing in the sun when clouds block it out?" "No," Jamie repeated. "We'll always be there, Jamie. And now" - he pointed at Jamie's heart - "we'll always be here." Jack smiled. "Which kinda makes you a Guardian too." Jamie was proud. Jack makes his way toward North's sleigh but he is stopped by Jamie calling his name. Jack turned around and is surprised by Jamie who gave him a hug, which shocks Jack, but he eventually returns the hug. Jack smiled as he stepped into the sleigh with the other Guardians. Jamie waved good bye as the sleigh began to speed along the ground. He ran behind the sleigh until it lifted into the air, heading to the North Pole. Jack was happy. Happy to have helped defeat Pitch and to finally know who he really was: a Guardian. He turned back to watch Jamie as the sleigh careened into the morning sky.