He is the only child who refused to give up on believing in the Guardians after Pitch Black's Nightmare attack.
Jamie is a young boy with brown eyes and short brown hair. Due to the "freak sledding accident" with Jack Frost, he has a missing front tooth (a left central incisor, to be exact.)
First and foremost, Jamie is a true believer; he is fascinated by the world of legends and mysteries, and this, of course, includes the Guardians. Jamie is very brave, shown best when he stood his ground with the Guardians against Pitch, and he is something of a bookworm, especially when it's a book about the supernatural.
Rise of the Guardians
Jamie first appeared when Jack returned to Burgess to give it a snow day. Jamie is seen reading a book until the wind blows it away. Jack finds the book interesting and asks Jamie about it, but Jack knows that he can't be seen by Jamie. Jamie's friends, Caleb and Claude, rush to Jamie and tell him about them having a snow day, and Jamie asks them if they are going egg hunting on Sunday. Jack follows Jamie to his house, listening to their conversation. Jack knows Jamie is a believer in the other Guardians and finds it offensive when Jamie's mom says, "Careful! You don't want Jack Frost snipping at your nose," Jamie asks, "Who's Jack Frost?" and his mom responds with, "No one, honey. It's just an expression." Wanting to have a little fun with Jamie, Jack throws a magic snowball that hits Jamie in the back of his head, causing a snowball fight between him and his friends. When Pippa accidentally hits Cupcake, everyone gets afraid. Jack, wanting to continue with the fun, hits her with a snowball, changing her attitude from mad to happy, which starts a game of chasing. The ground is slippery, making Jamie fall in his sled. The sled slides into the street, so Jack makes an ice path that brings Jamie, still in the sled, around obstacles in the street. He makes it back to the park, and flies so high that he goes over the statue of Thaddeus Burgess and into a snow drift. Then he gets hit by a sofa. Jamie, excited, reveals that he lost a tooth causing the conversation to go to the Tooth Fairy. Jack tries to remind them about the fun they just had, but gets sad when Jamie walks through him. Jamie is later seen by Jack that night when he tells his family about the fun adventure he had and the new drawing he made. He also tells them about the tooth and planning on seeing the Tooth Fairy. Jamie later appeared when Tooth and Jack returned to get his tooth and leaves a present. The Guardians all gather in his room but causes an uproar causing Jamie to wake up and see them (except Jack). Jamie's dog, Abby, starts growling at Bunnymund and Jamie tries to stop her. Jack wanting to have fun with Bunnymund, makes the alarm go off causing Abby to attack Bunnymund and makes him jump around the room. Sandy, trying to put Abby to sleep with his Dreamsand, ends up with him hitting everyone except Jack, Jamie and himself. Jamie flies out of bed when North lands on it and Sandy catches him. Sandman puts Jamie to sleep and then goes to fight Pitch's Nightmares that have appeared with the help of Jack. The next morning, Jamie is trying to find the eggs hidden by Bunnymund. He doesn't give up when his friends do. He tells them about him meeting the Guardians but they just tells him that it was a dream and that he should be happy that he still gets those and not Nightmares. Jamie is later left alone when his friends go home. That night Jack rushes 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 his 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 on his bed until the bunny turns into snow causing him to believe in Jack Frost. Hearing Jack's shock at his name being called, Jamie turns and gapes at him open-mouthed while Jack can only express his shock at Jamie saying his name. To his shock, Jack realizes Jamie is looking straight at him and asks him if Jamie can hear and see him to which Jamie nods. Jack is left near tears to have someone finally believe in him while Jamie is excited to meet Jack, especially when he learns that Jack was responsible for the incredible sleigh ride he'd gone on. When they hear North's sleigh, both of them rush outside. Jamie expresses awe at seeing the other Guardians and in the process, reveals that he can see Jack to North's amazement. Jamie is amused by Bunnymund being turned into a regular bunny, referring to him as "cute" instead of "cool" like he used to be and tells him and the other Guardians that it was thanks to Jack that he kept believing. 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 which makes Jamie tell Jack that he's scared. Hearing that, Jack gets a memory of the same thing his sister has said causing Jack to realize what his center is (Fun). Pitch approaches them but was hit by a snowball by Jack. Distracted, they escape and go gather up Jamie's friends. With the help from the other Guardians, Jamie's friends start to believe again. Pitch asks them who was going to protect the Guardians if the Guardians were protecting them. Jamie volunteered to protect the Guardians causing his friends to join him. Pitch 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. While the Guardians battle Pitch, Jamie gets an idea on how to revive the Sandman. The Sandman returns at the last second saving Jack from Pitch and uses his sand to give everyone good dreams and makes more believers. When Jack hits Jamie with a snowball, it caused a snowball fight. Pitch 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 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.
- Jamie has a temporary tattoo on his left hand.
- One of his mythology books was signed by Phil, one of North's yetis.
- Jamie has a great resemblance to Jack when he was human.