Harry Potter and all characters, etc. belong to J.K. Rowling, not me.
The Incredible Hulk belongs to Marvel.
Harry's Ultra Large Kind – Chapter 1 – Accidental Exposure
The beginning of this story is a brief summary of Harry's first year at Hogwarts, with a few noted modifications.
Harry Potter did something that was both very brave and very stupid. It was Halloween during his first year at Hogwarts School of Witchcraft and Wizardry, and he was attempting to save another first-year - a bushy-haired, bucktoothed girl named Hermione Granger - from a mountain troll that had somehow gotten into Hogwarts. While his red-headed friend Ron Weasley watched, Harry ran toward the troll that was breaking everything it could find in the girls' lavatory with a huge club.
Just before Harry reached the troll, a piece of the sink hit his right hand, cutting it. Ignoring the minor injury, he jumped onto the troll's back, accidentally sticking his magic wand up the troll's nose, causing it to bleed. What Harry didn't notice was that some of its blood got into Harry's open cut.
The dangerous situation was soon dealt with by Ron managing to levitate the troll's club high enough to drop on its own head, knocking it out. The teachers then arrived, now that the danger was over, and soon the kids were allowed to return to Gryffindor Tower. The school year proceeded from that time without Harry giving a second thought to the small cut that had quickly healed, certainly not realizing that his life had been altered forever.
It was a few days later that Harry played his first Quidditch match, and it was against Slytherin. He followed his instructions from the team captain – Oliver Wood – to fly above the match until he caught sight of the golden Snitch he needed to catch in order to end the game. Everything was going fine until, without warning, his broom gave a sudden, frightening lurch. For a split second, he thought he was going to fall. He gripped the broom tightly with both his hands and knees. He'd never felt anything like that.
It happened again. It was as though the broom was trying to buck him off. Harry tried to turn the broom to seek help, but couldn't. His brand new Nimbus 2000 kept trying to unseat him until a wild jerk managed it. He fell off his broom, but managed to grab onto it for dear life. As the Nimbus kept trying to make him lose his grip, he got more angry and scared by the second. For a brief moment, his green eyes started glowing, but then stopped. Harry soon realized his broom wasn't trying to murder him anymore. He climbed back onto the broomstick as his heart rate lessened. He then caught sight of the evasive Snitch and managed to catch it, but not in his hands as was normal. He caught his first golden Snitch in his mouth.
Several months later, Harry wound up in a detention in the forbidden forest, all because of Hagrid and his pet dragon, which thankfully had been taken from Scotland to Romania. Something had been killing the unicorns, so naturally first-years in detention were brought in to investigate in the middle of the night. Harry was currently stuck with Draco Malfoy and Hagrid's cowardly dog, Fang.
They managed to stumble upon the scariest sight Harry had ever seen. Some cloaked figure was drinking the blood of a unicorn. Malfoy and Fang immediately ran off. When he looked up, Harry felt pain in his curse-scar on his forehead and fell backwards. As he watched his attacker approach, Harry felt like something inside him was desperate to burst forth, but something was holding it back. That feeling went away as a centaur named Firenze got between him and what he'd later learn was Voldemort.
It wasn't long after that Harry found himself facing Voldemort again. This time the Dark Lord's face was sticking out of the back of Professor Quirrel's head. As the Defense Against the Dark Arts professor grabbed him, Quirrel's hands began to burn. As Harry pushed his hands on his attacker's face, he felt a surge of magical power flowing through him.
Unknown to Harry, it was altering the troll blood in his veins, giving it the power to cause a metamorphosis to occur in times of great pain or anger. His first transformation was about to occur, when Harry fainted from magical exhaustion. He was found unconscious a few minutes later by Headmaster Dumbledore, who took him to the Hospital Wing, where he remained until the closing feast. Then, not knowing that he was now literally one-of-a-kind, an ultra-large-kind at that, Harry Potter returned home to the Dursleys.
A/N This story was inspired by the TV movie from the 80's, "The Incredible Hulk Returns." In the movie, Thor repeatedly refers to the Hulk as a troll. It got me thinking…