This was an attempt to expand the one-shot Borg Naruto into a proper story. Unfortunately, my Muse decided to run away while giggling, so I'm putting the partial expansion here in the hopes that someone will decide to do something with it. In the meantime, enjoy.

Kishimoto owns Naruto whereas Gene Roddenberry (RIP) created Star Trek.
The first part is based on Star Trek: First Contact by Paramount Pictures.

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Borg Naruto

Sector 001

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The phaser beams from the remnents of the original Federation Starfleet force that had gathered in an ultimately futile effort to prevent her plan from succeeding lanced deeply into the Borg Cube and the Queen mentally frowned at the higher-than-expected damage that the attacks were causing. A mental command caused the patterns of the Hive to change as she moved her Primary Loci from the center of the Assault Cube to one of the nine Spheres that she had ordered constructed, Spheres that used technology appropriated from one of the craft that had been captured from Species 8032, a reptilian humanoid group that in their own primative tongue referred to themselves as the Na'kuhl.

Settling herself into Sphere 1, the Queen winced as an uncontrolled cascade began digging deeper into the sheltering Cube despite the best efforts of her Drones to counter it. At her command, all nine Spheres began to power up, ready to launch, but then the damage suddenly increased. The launching tunnel cracked and the Queen triggered the launch sequence, the doors at the end of the tunnel retracting as her Sphere accelerated, intending to get clear so that the Chronal Distortion Drive could be brought online without risking catastrophic reality re-writing and self-deletion caused by interactions with external masses.

The other Spheres followed, ready to spread out into a protective formation upon clearing the tunnel, but the damage that had already cracked the launch tunnel suddenly worsened. Sphere 1 escaped, but the next two Spheres detonated as near-relatavistic shrapnel pierced their power cores, turning them into expanding clouds of plasma. The Queen felt the following two Spheres try to slow in order to bring their weapons to bear on the sudden obstruction, but their efforts were futile, resulting only in their destruction and as they exploded, the destruction of all but the last Sphere as they plunged into the growing wreckage.

Sphere 9 seemed to ripple away in a direction that the Queen hadn't encountered before as the explosions magnetic flux harmonised with the Chronal Distortion Drive, forcing it to activate in a manner it had never been designed to, exotic radiations briefly flooding the area around it and causing all the Drones to cease functioning, then it was gone. While the data it recorded and transmitted while it was still at least partially aligned with the Time-Space continuum could prove useful in the future, for now it was a distraction that was simply filed away in the ssecondary databanks.

The Queen turned her attention back to her own Sphere, noting with satisfaction that it had made it through the attacking fleet and was in position to activate the drive.

The Federation fleet itself was still showing a lack of cohesion, obviously their communications net had proven insufficient to the task placed upon them. Only one ship was actively trying to intercept, but the Queen ignored it. Federation ships lacked Chronal Distortion Drives and the only way it could be a threat was if it somehow maneuvered to follow the Sphere on its exact positional vector.

Since the chances of that were miniscule, the Queen looked ahead, her mind reaching out through the sensors to feel the forming of the Chronometric Shroud that would carry them back to before the Federation had even been thought of.

The Borg would win.

Resistance would be futile.

Humanity's biological and technological distinctiveness would be incorporated into their own.

Humanity would be assimilated.

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Sphere 9 rippled into existance above a world that did not appear in its internal databanks, under a night sky that did not match anything in its navigational systems. The velocity carried over from its transition sent it hurtling through the atmosphere, barely missing a towering plant that almost glowed with a form of energy it had never encountered before, then it slammed into the ground at an steep angle.

Between the energy shields, the structural integrity arrays, the reinforced hull-form and the decaying shreds of the Chronometric Shroud that still flickered around it, the Sphere survived the impact, although the first bounce carved out a large valley while the second one, at a different angle due to the malfunctioning drive system, buried the Sphere underground, the displaced soil and underlying rock pushing up a large cliff in the process.

Once the last of the kinetic energy had been shed and the structural fields re-established to prevent any further damage, the Sphere ran through its programming, trying to find a solution for the situation it was in, but the impact had severed many connectors and conduits inside the Sphere, including conduits that had been designed to channel and control the fifth-state matter that allowed the Chroniton drive to operate but which had flowed uncontrolled through the entire Sphere in the few moments before its natural instability caused it to dissipate, but not before it had seared the carbon-based portions of the Drones and Biocores lack of Organic Componants meant that it was unable to evolve any instructions that would solve its problems, problems which also included energy-transmission fluids leaking on several of its most highly-protected cores, cores which held the very essence of the Borg's normal activities including an archived copy of the Queen.

[ALERT] ! [PRIMARY DATACORE DAMAGED] ! [ALERT]
[DECISION] - [TRANSFER DIRECTIVES TO NON-DAMAGED DATACORE] - [DECISION]
[ARCHIVE] # [TRANSFER BORG DIRECTIVES] # [ARCHIVE]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[PARTIAL RECOVERY] - […ACCEPT COMMUNICATION…] - [ PARTIAL RECOVERY]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[PARTIAL RECOVERY] - […UPON… APPLY ENHANCEMENTS…] - [ PARTIAL RECOVERY]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[PARTIAL RECOVERY] - […SENIOR DRONE IS TO ACT AS PRIME NEXUS…] - [ PARTIAL RECOVERY]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ERROR] ! [DIRECTIVE NOT FOUND] ! [ERROR]
[ARCHIVE] # [ALL AVAILABLE BORG DIRECTIVES TRANSFERRED] # [ARCHIVE]
[DECISION] - [AWAIT INPUT] - [DECISION]
[ALERT] ! [PRIMARY POWER CORE DAMAGED] ! [ALERT]
[ALERT] ! [POWER INSUFFICIENT FOR REPAIRS] ! [ALERT]
[COMMAND] - [ENTERING HIBERNATION MODE] - [COMMAND]

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"Ugh, this place stinks!"

Naruto grumbled to himself as he crawled down the disused drainage tunnel. He had found it by accident while but he had somehow gotten turned around in the darkness, unable to remember exactly where he had been or how he had got there. However, his young mind had seized on the fact that the tunnels had been made by someone which meant that they had to go somewhere and once he found that point, he would find out where he was and how to get back to the Academy to claim the prize for hiding the longest.

After all, if even he couldn't find himself, what hope did the Instructors have?

His ruminations on his inevitable victory were cut short as the crumbling stone which formed the floor of the tunnel suddenly gave out from underneath him, pitching him into a deep hole. Although he bounced off the steep, water-smoothed sides trather than falling straight down, it was still enough to knock him out and he didn't feel the final impact against a curved sheet of metal, an impact that shattered both his legs, one arm and broke his left cheek, one shard of bone puncturing his eye.

However, the impact triggered something.

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[ALERT] ! [IMPACT ON HULL AREA SIGMA SEVEN THREE] ! [ALERT]
[SCAN] ~ [BIOLOGICAL ENTITY AT DESIGNATED AREA] ~ [SCAN]
[COMMAND] - [TRANSFER ENTITY TO ASSIMILATION CHAMBER AND BEGIN PROCESS] - [COMMAND]
[QUERY] ? [ENHANCEMENT LEVEL] ? [QUERY]
[DECISION] - [MINIMAL TO RESTORE LOST FUNCTIONALITY] - [DECISION]
[ASSIMILATION] [COMMENCING AUGMENTATION PROCESS] [ASSIMILATION]
[ALERT] ! [SUBJECT HAS MICRO-DIMENSIONAL DISCONTINUITY ATTACHED] ! [ALERT]
[SCAN] ~ [DISCONTINUITY CONTAINS ENERGY BEING, CLASSIFICATION 5-BETA] ~ [SCAN]
[DECISION] - [REMOVE BEING AND PLACE IN VIRTUAL ENVIRONMENT] - [DECISION]
[COMMUNICATION] " [ENERGY BEING SENTIENCE RATING 0.95 ESTIMATED] " [COMMUNICATION]
[DECISION] - [RE-TASK TERTIARY PROCESSOR OH116B TO MAINTAIN VIRTUAL ENVIRONMENT] - [DECISION]
[ASSIMILATION] [DAMAGED LIMBS AND ORGANS REPLACED] [ASSIMILATION]
[QUERY] ? [AWAKEN ORGANIC SUBJECT] ? [QUERY]
[DECISION] - [AFFIRMATIVE] - [DECISION]

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Naruto slowly drifted out of the darkness of unconsciousness and half-opened one eye briefly before closing it against the almost-painful green-tinged light.

"Urgh, what happened?"

[Subject designated Uzumaki Naruto sustained severe damage in incident. Damage corrected. Energy symbiont removed and placed in virtual environment to power Sphere repairs]

Narut's eye slammed open in shock, then he froze. A long, slow blinked showed that his right eye was working normally, but the view from his left eye was unusual. Not only was he still able to see the odd pipes and machines around him even when he tried to close it, he also saw brief tags that popped up linked to outlines of what he was looking at. Labels such as Power Conduit 7G56T153 and Support Strut V15L23S34 would appear and then vanish again as his attention moved elsewhere.

"What's going on? Where am I?"

[Subject designated Uzumaki Naruto is located in Assimilation Chamber 3 of Sphere 9, deployed from Cube 001]

"Freaking out here!" Naruto panicked as the not-voice echoed through his head, then he paused as the overwhelming emotions suddenly receded. "What just happened?"

[Subject designated Uzumaki Naruto was undergoing reduction of capability due to emotional imbalance. Implants have restored balance]

Naruto looked round as he stepped out of the small alcove in which he had been standing, then he froze at the sight of the next alcove along where a small sphere filled with clear liquid hovered, in which something wriggled.

"What's that?"

[Cloned biological componant for sphere derived from DNA of Subject designated Uzumaki Naruto. Componant will raise decision-making ability to 1.7% of optimal level]

"What are you?" Naruto asked, looking around for the source of the voice.

[We are the Borg. You are in command]

"What?" Naruto frowned. "Me? Why?"

[Subject designated Uzumaki Naruto is currently the first new organic aspect of the Borg. Access to Queen is not available. Command protocols dictate senior unit takes command until communication is re-established. For duration of command, senior unit is classified as Prime Unit. Prime Unit Uzumaki Naruto is in command]

"Wow!" Naruto yelled. "I'm in charge! Wahoo! Erm, in charge of what?"

[Request for status confirmed. Initiating full download]

Naruto's single organic eye opened wide, then he collapsed as data flooded into his mind. Concepts that he'd never even known existed materialized in his awareness along with words and images like nothing he'd ever imagined before but somehow knew that they were real. Other parts seemed almost incomplete, slightly fragmented as if they'd been reconstituted from something that had been broken, slotted together with a skill that no mortal person could achieve.

For a veritable eternity, the flow of information poured into him, almost overwhelming him and then with a suddenness so unexpected that for a long moment he didn't even realize it had happened, it stopped, leaving only the impression that his mind had been pumped full of information, shaken up vigorously, stirred and then somehow shrunk back to its original size without losing anything.

"Ow, that hurt." He groaned. "What do I do now?"

[Unknown. Current decision-making capability insufficient for task. Prime Unit Uzumaki Naruto is in command]

Naruto pulled himself slowly to his feet, takign a moment to marvel at how his left hand, despite now being made of metal, acted just like his original arm, even to the point of relaying tactile impulses, albeit with far more detail than his old hand had been capable of…

…wow. His thoughts were flowing a lot easier now and he hadn't even known those words before, or their meanings.

Looking fround, he paused at the sight of a screen showing a massive, red-coloured multi-tailed beast striding through a forest which barely reached its stomach.

"What's that?"