The words at the beginning of this chapter were taken from Harry Potter and the Goblet of Fire Chapter 32.
I'm ignoring Trelawney's second prophecy, about Wormtail finding his master and helping Voldemort to become even more terrible than before.
Some readers possibly have never seen a Terminator movie. Such movies, usually starring a former Austrian bodybuilder, feature brief public nudity, killings, explosions, killings caused by explosions—and at least once in every movie, a Terminator walking unharmed and unbothered out of a wall of flames. My point is, a Harry Potter-Terminator crossover fanfic will be full of gratuitous violence (and brief public nudity). You have been warned. However, this story will have no "Terminator walks out of the flames" scene.
Chapter 1
Ahnulda
24th June 1995; dusk
Just after Harry and Cedric grabbed the Triwizard Cup
Harry's leg is injured from the Third Task
In the Little Hangleton graveyard
Cedric asked, "Did anyone tell you the Cup was a Portkey?"
"Nope," said Harry. He was looking around the graveyard. It was completely silent and slightly eerie. "Is this supposed to be part of the task?"
"I dunno," said Cedric. He sounded slightly nervous. "Wands out, d'you reckon?"
"Yeah," said Harry, glad that Cedric had made the suggestion rather than him.
They pulled out their wands. Harry kept looking around him. He had, yet again, the strange feeling that they were being watched.
"Someone's coming," he said suddenly.
Squinting tensely through the darkness, they watched the figure drawing nearer, walking steadily toward them between the graves. Harry couldn't make out a face, but from the way it was walking and holding its arms, he could tell that it was carrying something. Whoever it was, he was short, and wearing a hooded cloak pulled up over his head to obscure his face. And—several paces nearer, the gap between them closing all the time—Harry saw that the thing in the person's arms looked like a baby ... or was it merely a bundle of robes?
Harry lowered his wand slightly and glanced sideways at Cedric. Cedric shot him a quizzical look. They both turned back to watch the approaching figure.
It stopped beside a towering marble headstone, only six feet from them. For a second, Harry and Cedric and the short figure simply looked at one another.
And then, without warning, Harry's scar exploded with pain. It was agony such as he had never felt in all his life; his wand slipped from his fingers as he put his hands over his face; his knees buckled; he was on the ground and he could see nothing at all; his head was about to split open.
From far away, above his head, Harry heard a high, cold voice say, "Kill the spare."
"Avada—"
Cedric's brain screamed, I don't want to die!
Cedric had naively believed that, after he and Harry had defeated the Acromantula and together had grabbed the Triwizard Cup, that his problems were over.
Now the short, hooded man was pointing his wand at Cedric's face and had begun the Killing Curse. Meanwhile, Harry was lying prone on the ground, vomiting and moaning, and had dropped his wand. The Boy Who Lived would be no help at all to Cedric in the next few seconds.
And seconds was all that Cedric had left to live.
Then Cedric was surprised by quick movement in his peripheral vision. The hooded man, whilst carrying the baby, had walked up to stand next to a moulded-concrete graveyard angel. Now the angel yelled "Negative!" and the angel moved—
In the fading light after sunset, Cedric saw the angel rush up to the hooded man and, snake-quick, grab the wand out of the man's hand.
"Cedric, catch!" the angel yelled.
The hooded man's wand was tossed to Cedric, who was gladder to catch this wand than he had ever been glad to catch any snitch.
Meanwhile, the moulded-concrete angel had shapeshifted. Now she looked like a naked young woman, with apple-red eyebrows and apple-red hair that was bushy, exactly like the hair of Harry's friend Granger.
The angel-now-naked-woman had her right hand wrapped round the hooded man's wrist—a grip which, despite his struggles, had him immobilised—and she was diving her other hand into the pocket of the hooded man's robes.
A second later, another wand was tossed towards Cedric. The naked woman said, "Cedric, do not let these two take back this second wand. Kill if necessary."
Cedric choked, hearing such words.
Then—most shocking of all to Cedric—the naked woman grabbed the wrapped-up baby out of the hooded man's arms and tossed the baby to the ground.
"Oof!" the baby said. "Do you know who I am, woman?"
The naked woman replied in matter-of-fact tones, "You are Tom Marvolo Riddle, which anagrams to 'I am Lord Voldemort.' You are the illegitimate son of a Squib and a Muggle. Both your parents are dead, but in life, they lived close to here. You are a halfblood who claims to be a Pureblood."
The baby stared at the naked woman, shocked silent.
Cedric was staring at the baby, just as shocked. Cedric thought, You-Know-Who is alive? And he's here?
By now, previously prone Harry was on his hands and knees, trying to stand.
Meanwhile, Cedric asked the naked woman, "Who are you?"
She replied, "This unit is neither a magical human nor a nonmagical human; this unit is a machine. This unit is a TRT model HG-1000, Unit 1, which came online in 2057. This unit's creator named it Ahnulda."
Cedric blurted, "You're from the future?"
Harry asked, "Who is your creator, Ahnulda?"
The naked woman replied, "The answer to the first question: Yes. This unit will not answer the second question whilst Peter and Tom are listening."
Harry yelled, "Wait, Peter's here?"
To Cedric's surprise, Harry rushed forwards to stand in front of the short man. Harry's hand shoved the hood back, revealing the short man's face.
"Peter Pettigrew!" Harry snarled. "I stopped Sirius and Remus from killing you, and you 'thank' me by trying to kill Cedric tonight?"
Peter abased himself, saying, "I didn't mean it, Harry! Just like I didn't mean for your parents to die either."
"Silence, Wormtail!" yelled Baby Voldemort.
Meanwhile, Peter again struggled to break the grip of the naked woman. Again, he was unsuccessful. "Please, ma'am, let me go!"
"I want to kill you," Harry said to Peter, "but I'm better than that."
Harry stepped back by Cedric's side and was using his wand to clean himself off. He said, "We've a big problem, Cedric. That baby is Lord Voldemort, he looks just like him, and he tricked the Cup into bringing us here. But I've no idea why."
Ahnulda replied, "See that 500-gallon cauldron over there? Voldemort planned to take Harry's blood, as part of a dark ritual to give himself a new body. Then Voldemort planned to kill Harry."
Ahnulda added, in a voice as calm as if she were describing the weather, "Instead, it is Peter and Tom who will die today. This unit has targeted them both for termination."
The baby laughed. "You cannot kill me—Lord Voldemort is immortal!"
Ahnulda replied calmly, "This unit knows you believe this." But what you believe is not true went unstated.
The baby scowled.
Then Ahnulda switched which of her hands was gripping Peter's wrist. Ahnulda said, "Also targeted for termination..."
Ahnulda's now-free right hand and arm shot down and out—and out, and out, and down and down. Somehow Ahnulda's right arm and hand became a long, steel spear.
A giant snake, which Cedric had not noticed before, because the giant snake was behind himself and Harry, now was stabbed in the head. Something dark rose up from the snake's stabbed head, screaming.
Baby Voldemort yelled, "No! Do you know what you've done?"
"I'm out," Peter Pettigrew squeaked. To Cedric's shock, Pettigrew swiftly began to shrink.
Several times since first year, Cedric had watched Professor McGonagall shrink down and become a cat; the process had taken only a second. Similarly, now Pettigrew yanked his shrinking hand free of Ahnulda's grip, then shrank down to the size of a cat—
—but Pettigrew kept shrinking, till a brown rat stood where the man had stood.
The rat ran. Cedric discovered that rats were fast.
But Ahnulda was faster.