A year after Jamie and Sophie became Guardians found Jack flying low over the very top of the Himalayas after having his very first fight with Jamie ending with both of them being hurt by the things that were said by them both. As he flew jack noticed something he never had before, a building or temple of sorts hidden away on top of the mountain. Curious about what it was he flew towards it. Landing in what appeared to be a court yard with men around Sandy's height walking around in it.
One of them, who was holding a long staff with a crescent moon on top, saw Jack not long after he landed and was surprised at his appearance. "Who are you? Why do you look like Nightlight?" He questioned Jack after approaching him.
Jack met the man's gaze as he replied, "I'm Jack Frost, you know Spirit of Winter and Guardian of Fun. Who is Nightlight? Is he a Guardian, if he is then why haven't I met him?"
"Nightlight is the Man in the Moon's protector. You haven't met him yet because he prefers to mostly keep to himself as he travels the world doing his job the Man in the Moon gave to him."
Jack takes in what the man told him, wanting to meet this Nightlight to see for himself what he is like and after bidding the man goodbye flew off to begin his search for the elusive Nightlight, having forgotten his fight with Jamie. The weeks pass, Jamie and Jack forgave each other and soon were causing mischief once more.
On the night of Christmas Eve North invited both Jack and Jamie to join him as he delivered presents to the world's children both of them eagerly accepting and climbed into the sleigh. Their last stop was a place called Santoff Claussen where North lingered, as if he waited for something or someone, after placing the last present under a tree outside while Jamie and Jack explored coming across the Spirit as well as the bear that guarded the forest surrounding Santoff Claussen.
"Jack, Jamie come there is someone you should meet." North called after a while bringing both boys running, or in Jack's case flying, towards him. They come to a stop when they see a sprite of a boy hovering in the air next to North, the man talking to him as if he knew him.
"Who is that?" Jamie asked Jack who only shrugged, shaking his head.
"I've never seen him before but it appears North has judging by the way he's treating him I'd say they're old friends." Jack answered as he cautiously made his way towards North and the unknown boy next to him Jamie following right behind.
"Ah Jamie, Jack there you are. Come, come you meet new friend." North beckoned them closer and once they stood in front of him and the unknown boy North smiled as he gestured to said boy. "This is Nightlight. Nightlight meet Jack Frost and Jamie Bennett, Guardians of fun and bravery."
Upon hearing the boy's name Jack jerked his head to get a look at him, taking in his white hair much like his own, body, which more slender then his own, his laughter filled eyes, the armor covering his body and the staff he carried, its tip seeming to glow with an unknown source of light. "So you are this Nightlight that the man living on top of the Himalayas told me about." Jack stated shocking North.
"You were at the Lunar Lamadary and didn't tell me." North said.
Jack shrugged, "If that is what that place is called then yeah I was there. It was after I had that fight with Jamie when I found the place and decided to check it out." After spending a few minutes more visiting with Nightlight North decided it was time to head back to the Pole so Jamie and Jack raced each other back to the sleigh while North bid farewell to Nightlight, watching as the boy flew off to only he knew where then joined Jack and Jamie in the sleigh.