Author's Note: Hello everyone. Cranky Kong here. This idea has been nagging in the back of my head for so long; I couldn't make any progress on my other stories until I at least started this one. Quick shout-out to Lady Tralalala for encouraging me to add more to the Frozen fandom. And let me welcome you to my very first crossover fic. But before it begins, my new sidekick shall establish the setting.

Rose's note: That's CO-WRITER! Anyway, this story is how Cranky imagined a Frozen world would be in Kingdom Hearts 3. As this is after Dream Drop Distance, Sora has failed his Mark of Mastery and nearly become one of Master Xehanort's Thirteen Darknesses. These combined with several attacks on his psyche have shattered our hero's usual confidence. Now, he attempts to seal as many worlds as he can find in preparation for Xehanort's assault. And tries to resolve the conflict within himself.

(Chapter 1)

"So it was you. You're the one who turned Tron into Rinzler!"

"Correct. I had to repurpose his code."

"Well, un-repurpose it!"

"Under the right parameters, I might. You have an item called a Keyblade, correct? Which can open any lock? Hand it over, and I'll change Rinzler back into Tron."

The boy stared at his weapon, then at his corrupted ally, "The Keyblade? I…I can't. This is what lights the darkness. A chance to make everyone happy."

"Flawed reasoning. I'll have to take it by force." CLU gestured at Rinzler to attack, then departed.

Sora remembered everything: every crack and dent his Key made against Rinzler's armor, the burning pain of the program's disks against his flesh, and feeling as if his heart would shatter every moment he fought his friend. Finally, he'd used a limit, Setup, the same one he'd done with Tron against the MCP two years ago. The move had worked, and his opponent, injured but still alive, had fallen to the ground. But their brief peace was shattered when CLU attacked, hurling his disk towards the user's back. Sora suddenly felt himself being shoved sideways and saw Rinzler deflect the attack. The disk ricocheted off a nearby wall and smashed into the ground beneath him. With nothing to hold him up, the program fell to his death, just missing Sora's outstretched arm.

"TRON!" The boy started awake, panting from terror. He'd had the nightmare again for the third time in a month. Pounding his fist into the pillow, he squeezed his eyes shut in a futile attempt to banish the memories.

I couldn't save him. He was right in front of me, and I couldn't save him! I failed a friend.

All of his fears and doubts began to surface at once. He'd failed the Mark of Mastery; he wasn't strong enough to keep the Xehanorts from putting him to sleep; and the Keyblade hadn't really chosen him. In that moment, the boy was struggling to hold back tears. What saved him however, was the Gummi Ship's siren.

"Sora?" Donald's voice filtered over the loudspeaker, "we're approaching our next world and need you to help guide the ship down.

"R-right, on my way." After a quick change of clothes, he rushed to the cockpit. Dwelling on the past wouldn't help now, he had to focus on the present. The new world needed to be sealed with the Keyblade in case Xehanort tried to plunge it into darkness. Besides, Tron would have wanted him to press on and ensure no one else suffered his fate. "So guys, where are we landing?"

"According to the scanner, the world's keyhole is located in the kingdom of…Arendelle."

(Within said kingdom)

It was chaos. Total chaos. The coronation of the kingdom's queen had gone terribly wrong. The queen had accidently unleashed a storm of frost magic that had encased the whole courtyard in ice and fled into the mountains. The love and admiration upon her subjects' faces had been replaced with fear and uncertainty, which had only intensified when the summer sun gave way to a brisk snowfall. No one knew what to say or do, and everyone was afraid. The Mistress of Evil drank it all in. Why, there hadn't been this much negativity in the air since she'd cast her spell upon Aurora so long ago. To think that one woman was the source of it all; one woman could whip them all into a frenzy. Such power even rivaled her own. Maleficent had to take advantage of this. With that much fear in her heart, the girl was already halfway to becoming a Heartless. With a smirk upon her lips, the evil fairy vanished in a swirl of green fire. The time of her vengeance was near.

(End of Chapter)

A/N: When I first saw the outcome of the Rinzler fight in Dream Drop Distance, I was floored. It was the first time I'd seen Sora experience a true failure in one of the Disney worlds instead of getting a happy ending for everyone. Not to mention his first experience with death (not just losing your heart, but honest to goodness death). I figured that he wouldn't forget that for a long time.

R/N: As for what that has to do with Frozen…just know that there is a connection. But you'll have to wait and see.