Harry abruptly stopped walking to bend over, clutching at his chest in agony. He had been about to apparate to his hotel when his magic flared up. It bucked against the barrier he had around his core, fighting to be released. The lady who had been escorting him was panicking, trying to grab Harry's attention.
Harry grit his teeth and, smiling at the screaming woman, let his fiery magic wash through him, unable to control the white-hot flames before he disappeared from the apparation room with an inaudible 'pop'.
"Mr. Potter?!"

Appearing in the middle of a destroyed street, Harry gasped in pain and fell to the ground. The wizard laid on the gritty blacktop of the street for a few moments, before his magic reasserted its need to move. Pushed by his 'spidey sense', Harry reluctantly forced himself up and staggered forwards to a place where major amounts of pain emanated like radioactive decay.
Approaching a large hunk of metal, Harry grimaced as the pain grew worse. The healer leaned against one of the standing pieces of metal for a second, trying to catch his breath, before hoisting himself up to crawl over other pieces of metal, failing to see the small sparks of blue magic shooting into the odd scraps.
Harry stopping crawling near the other end of the mass of metal when he nearly fell into a gaping hole. Sticking his head through it, Harry wondered if a human had been injured inside, though he couldn't see anyone. The only thing he could see was a small, glowing piece of blue glass laying at the bottom of the pit.
Seeing his hands begin to glow brightly, Harry idly wondered who he would heal. Watching as his healing magic unfurled, spreading throughout the pit and covering every jagged edge and crevice, Harry waited for something to happen, as his magic seemed to refuse to touch the glowing, blue shard of glass.
This observation quickly became untrue; however, when Harry's magic suddenly engulfed the glowing shard until it could no longer be seen. Gritting his teeth in pain, Harry nearly shouted at the surprise fire that rushed through his veins.
As the new energy from the shard mixed with his magic, Harry was lifted off of the ground, a strong elemental wind picking him up and blowing his hair wild. Screwing his face up to the sky, pure yellow eyes burned with power as they stared off into space.
And just as suddenly as Harry had been picked up, he was dropped. Green eyes narrowed as hands began to glow a brighter blue and Harry's magic expanded from just the pit to the whole top section of the metal mass he was on.
Harry stood, frozen, for what felt like hours as he felt his magic draining out of him. The pit he had been standing before slowly began to close up as a giant ball of his energy rested near the bottom. The metal surrounding the magic ball, which Harry would have to assume was now the metal's magical core as odd as it was to contemplate, moved like liquid, flowing to cover the remaining holes and scars until most of the metal was smooth and flawless. Harry collapsed to his knees for a second time as he watched his magic move further away from him and the new core. It surrounded the end of the metal mass, making all of its sharp points glow ominously in a blue light.
As Harry felt the drain on his magic begin to weaken, he almost cried in relief. He hadn't had a magical exhaustion as strong as this one since he had decided to layer an ancient growth charm from the Himalayas. Who knew making your body five times it's normal size stretched out your magical core too quickly for it to reach equilibrium without mass consequences? Harry hadn't, and now he wished he hadn't tried to heal a gigantic hunk of metal either.
The wizard's sight slowly began to dim as the ground shook. He felt himself fall and smack his head, his vision exploding with stars in the darkness. Trying to blink them away, Harry only caught a glimpse of giant, glowing eyes before he could see no more.

At first, it knew nothing. It was only an it because it could perceive itself. Everything was as it was, nothing changing and ever the same. Then, it heard. An indistinct creaking noise disrupted the quiet that had always lingered. With this noise, came notions. The passing of time became apparent and the noises were understood. The creak belonged to metal, overstressed and about to collapse.
As it listened to the metal finally crack and the following avalanche of debris, it began to feel. It could feel it's adult armor covering it's internal wiring and all it's appendages, but it's chassis was... off. There was a small weight just below the chassis, as well as an odd feeling in it's armour. Further moving it's body in small twitches, it realized that it was a mech, rather than just an 'it'.
He sighed in his processor, realizing that the thought of being a femme was disturbing. To be a mech was a relief as femmes were dirty, deceitful, and utterly disgusting in their build. The mech's processor stalled for a moment, searching for the place that opinion came from.
As he reached, more data slowly filtered into the mech's processor, re-downloading lost information, opinions, and experiences. Private channels were reestablished and messages reopened. So many questions began to fill the mech- no, Megatronus' processor, as some the data coming back didn't fit with the others. Why did he have a whole legion of Cybertronians following him when he wasn't a Prime? Why did he have such a deep-rooted hatred for a Prime? Especially one that had been like a brother to him when his carrier had been offlined? And, better yet, when did he support the killing of his fellow Cybertronians?!
As Megatronus' optics finally started to online, the mech pushed his panic to the back of his processor. Now was not the time to be questioning his past actions. He didn't know where he was or why, and wasn't sure if he could trust the information that was being supplied to him. Being brought back to life after taking the Allspark to his chassis wasn't a very plausible explanation, and so Megatronus opened his optics.
Staring into a blue sky the likes of which he couldn't remember properly enjoying, Megatronus knew at least half of the information in his databanks was correct, as Cybertron had never had clouds, nor a single star to light the sky.
Sitting up slowly to look at his surroundings even with his body being stiff- mostly from lack of energon flow, Megatronus suspected- the small weight he had forgotten was on his chassis tumbled off, and the mech barely caught it in his palm before whatever it was hit the ground.
Turning his optics down, Megatronus was surprised to connect them with emerald green. Staring at the small being in the palm of his servo, Megatronus realized it was a male human that he- FLESHIE!- ...held. Ignoring the strange- and rather alarming- impulse to squish the fleshling to death, Megatronus analyzed the small, organic being, only to see he had fallen into recharge within the few moments he had been distracted. What an odd fleshling. From his databanks, humans usually were frightened of his race, going so far as to scream, run away, or attempt to harm them. The only humans he knew not to do such things were Sam Witwicky and Mikaela Banes. The Witwicky boy had been a special human, a descendant of the man who had found him when he crashed here. Was this human another special one? Megatronus scrunched up his faceplate in thought as he scrutinized the human much more closely. There was definitely an odd energy field emitting from his body. Perhaps that was what made him special. Megatronus decided he would keep this fleshling, just to see. It wasn't as if any other fleshing would mind either, as other information from Megatronus' processor stated humans moved in groups, called 'families', and were rarely too far apart from one another. Looking around, Megatronus could see no other humans. Though the sight of the rubble and dried energon surrounding him reminded the mech of the possible reason he was there in the first place.
Had he really been offlined?

-

Checking again to make sure his cargo was properly strapped in and hidden, Megatronus transformed and made the flight to the Nemesis in silent contemplation. The large Cybertronian approached the aircraft with internal dread, but transformed to land smoothly on his peds nonetheless.
Fixing a practiced scowl on his face, Megatronus ordered a nameless vehicon soldier to permit him entrance to his ship and stalked through the memorized hallways in search of his second-in-command, as he was wont to do whenever angered.
"Starscream!"
A sleek, silver Decepticon scrambled out of the throne Megatronus usually sat in to stand by its side, head bowed and an arm crossed over its chassis. "O-oh, L-lord Megatron! How amazing it is to see you! Why, I'll have to-"
The stammering Cybertronian tried to nonchalantly flee his lord, but Megatronus merely narrowed his optics.
"Hold it, Starscream."
The seeker turned around with wide, innocent eyes and a shaky smile on his terrified face. "Y-yes, Milord?"
"What damages did we sustain from the battle?"
Starscream straightened with a small, relieved sigh. "Not too many, my Lord. Only Blackout, Brawl, and a percentage of our vehicons were offlined."
"Have we recovered their remains yet?"
Starscream straightened with confidence as he responded affirmatively. "Of course, Lord Megatron. They await to be harvested."
Megatronus stalled his faceplates from contorting in horror, but they still pointed into a fiercer scowl. "They died honorably, did they not? Our fallen soldiers will receive a proper Cybertronian sendoff. Then, and only then, will you be allowed to harvest them. Are we clear on this, Starscream?"
The Decepticon seeker frowned lightly in confusion, but something in his faceplates relaxed as he bowed in acquiesce. "Of course, my liege."
Megatronus nodded his head sharply before turning his back on his second-in-command to sit upon his throne. "Then you are dismissed, Starscream."
Megatronus didn't know to feel sad or happy when he heard the traitorous seeker scrambling to leave the room as quickly as possible. He would need to mull over his approach to this a bit longer than he originally thought.

-

Upon awakening from his recharge, Megatronus felt a curious tapping in the center of his chassis. After a moment of searching, Megatronus' processor supplied the memory of stashing the small human in his armour.
Opening up his spark chamber with curious optics, Megatronus froze as his optics caught sight of the small being tumbling from his chassis. KILL THE FLESHBAGS. KILL THEM ALL. DO NOT- Megatronus fought back control of himself as his processor was momentarily fried.
When the human had fallen from his spark chamber and his processor raged, the small being had not hit the ground as they usually did when not aided by another force, but he rose up, as if in flight.
Raking the Internet for any kinds of technology capable of giving humans flight, Megatronus was stumped when all devices aiding flight could not be found on the being. This human was a special one. Megatronus couldn't help the smile that took over his faceplate nor could he stall the happy thrum of his spark.
"Who are you, sir?"
Blinking his optics, Megatronus was thrown from his previous thoughts when the little being spoke. His voice held power, the likes other humans had never had.
A playback of a similar voice popped up in his processor. Megatronus understood it to be the commanding voice of Orion Pax, the Prime. Could it be that this little being commanded humans as well?
Placing one servo on his closed spark chamber, and the other under the hovering human, the Cybertronian inclined his helm. "I am Megatronus, ex-miner, ex-gladiator, and Leader of the Decepticons. Who are you, little human?"
The male looked up at him in wonder for a moment before he landed in Megatronus' servo. "Erm, Harry Potter, Arcane Healer and... Leader of the Light, I suppose..."
Megatronus smiled at the small being, attempting to ease the little being's discomfort. "I had thought so, you hold the air of a commander. How are you feeling, Harry Potter? I'm afraid to say I did not monitor you after your descent into recharge."
The small being vented quietly before sitting down in Megatronus' servo, resting his helm against one of the Cybertronian's digits. "It's okay, I am just a bit tired. I... I was the one to heal you back in Mission City... And what are you? If you don't mind me asking. I have never seen a being such as yourself."
Megatronus hummed in contemplation as another of his hypotheses was proven right. He had offlined back in Mission City, then. Just how had Harry Potter done it? "It is quite alright, little human. I am an Autonomous Robotic Organism from the planet Cybertron. We call ourselves Cybertronians, though currently our race is divided between two factions which each hold their own names for themselves: the Autobots and the Decepticons. I am grateful for your help, as well. I fear my spark may have been lost on this planet had you not aided me in my recovery. I am currently in prime physical condition."
Harry Potter seemed to sink further into Megatronus' servo as the giant mech spoke, and yawned once the metal being had stopped his rumbling voice. "I'm glad. Welcome to Earth then, Megatronus. I-" Harry Potter opened his mouthplates in -what the internet assured Megatronus was called- a 'jaw-breaking' yawn. "I'm feeling a bit tired, honestly. Could I... just go back to... that cave thingie... I was in?" Megatronus looked at the male curiously as his optics fluttered open and closed until it seemed that Harry Potter had finally succumbed to recharge.
Unsure of what exactly to do with the human being now that he was unresponsive, Megatronus simply stared as his processor wandered over random pieces of data.
Thoughts of healing abilities, Optimus Prime, and Autobots were cut off abruptly as a deep grumbling emitted from the recharging Harry Potter in his servo. Powering up his scanner in concern, Megatronus analyzed Harry Potter's body. Several warnings popped up in his processor as the scan sorted through the alien tissue. What surprised Megatronus the most however, was neither the multiple injuries that Harry Potter sported, nor the lack of nutrients, but the confirmation that his spark was strong. From all his data on humans, they did not house sparks, but 'hearts'.
Filing that interesting piece of data away for later consideration, Megatronus decided that his human's needs would have to be settled that day. He would have to fly to a nearby human settlement and retrieve the supplies needed to return Harry Potter to optimal conditions and keep him there. No human under Megatronus' care would ever be purposely damaged, no matter the dark impulses in his processor that continued to make a nuisance of interacting with the human.

-

Winding his way towards the exit of the Nemesis, Megatronus worked to maintain the deranged mask of Megatron as his soldiers quaked with his mere presence. It was disgusting, thinking about what he did, even if it wasn't truly himself doing the deed. Sure, Megatronus had all the memories, but he couldn't process why he had acted so terribly. He didn't blame Orion for opposing him and his faction- they were all monsters. Killing innocent humans? Hunting down Cybertronians? It was enough to make Megatronus' energon lines boil. He couldn't bare to let this monstrosity continue much longer, but the only option required time. The only way Megatronus could think of to stop the terrible acts and manage to decrease the possibility of violent Cybertronians rising together again was through small alterations. One less raid here, a little less destruction here, and one less dead corpse there, and so on went the list.
"Greetings: Megatron."
Megatronus' optics widened as he turned to see Soundwave walking beside him. The mech had a blank look on his face, as always, but it warmed Megatronus' spark to see one of his best companions. He couldn't reveal his sudden change to him, however; as Soundwave had always been a bit unpredictable. "Soundwave. Do you have anything to report?"
"Negative."
Megatronus noticed the odd quirk in his old friend's faceplates, but said nothing of it. Megatron would never inquire as to a bot's feelings. "Why walk beside me then?"
"Conclusion: Megatronus has returned. Effect: Soundwave is... relieved." Megatronus stopped his walk then, turning to stare at the mech beside him in confusion. "I am not. My designation is Megatron, as your lord."
"Desist. Soundwave will not reveal."
Megatronus vented as his shoulder plates drooped a little. "Thank you, Soundwave. However, how did you find out? Am I that obvious?"
The near-silent mech lifted a hand to point at Megatronus' faceplate. "Negative. Optical color change."
Megatronus rubbed at his faceplate as he frowned. "I see. My programming must be picking up on my old affiliations. Do you have any ideas, Soundwave?"
Soundwave stood still for a moment before a light zipped across his facial screen. "Idea: Install an optic protector. No other alternatives currently available."
Megatronus nodded, his processor flying over the pros and cons of installing a visor. "Thank you, Soundwave. I'll consider it. However, I'd like to keep that as a last resort, so please continue to ponder this, as will I."
"Affirmative." The small mech turned away from Megatronus and began to walk in the opposite direction of the Nemesis' exit.
"And Soundwave?"
The mech stopped in his tracks, looking back at his old friend with his usual blank screen.
"Thank you."
A digitized smile flashed on Soundwave's screen before the mech continued his walk.