Harry Tennyson!

Summary: What if Lily and Petunia had three other brothers and they weren't Evans by birth, but Tennyson's? After Lily's death, Petunia sends Harry to one of her older brothers Carl Tennyson, who tragically lost his own son, Ben Tennyson, not long before Lily's death from a bad case of flu. When Harry winds up with the Omnitrix attached to his wrist will he make the same decisions as Ben would, or will he make his own mark on the world?

Smart/Very Powerful/Omnitrix and Magic Wielding/Harry and Super Smart/Very Powerful/Magic Gwen. The story is set ten years later then in canon of Harry Potter to fit the tech that'll show up in the story.

Disclaimer: Harry Potter belongs Rowling, and Ben 10 was created by Man of Action, and produced by Cartoon Network Studios. I don't own anything from them, nor do I get any money from this. All I own is the plot and the ideas that came to me.

Warning: If you read my other work, you'll know what to suspect in this story, but as for Harry been good, evil or grey, and the pairings - it'll be at least a threesome or more - I don't know of yet. We'll just have to wait and see how the story comes along. Suggestions and ideas of any kind are welcomed.

Chapter One!

How it began!

1st of November 1991:

"We will not be keeping him, Pet!" Shouted a large man with short neck, a small amount of hair, and watery blue eyes. This was Vernon Dursley, wife of Petunia Dursley nee Evans, who was sister of Lily Potter nee Evans.

"That freak left him here, Vernon! For all we know they'll be watching us to make sure we keep the brat!" Petunia shouted, not at all happy with the situation either. She was an extremely thin woman with a long neck and blonde hair who loved to gossip about anything and everything.

"I don't care! I don't want his kind living under my roof! We'll take the little brat to an orphanage or something!"

The two adult Dursleys were currently yelling about a baby they had found on their doorstep this morning when Petunia opened the door to get the daily milk. The note informed them about the death of Petunia's sister and her husband, and telling them they had to look after the baby until he was eleven, where he would go to the magical boarding school. It also said as long as the baby was with his blood family, both he and them would be protected from those who would do them harm.

Who was this baby you ask? This baby was a sixteen months old, had a bird's nest of black hair, the most stunning emerald green eyes, and a peculiar scar situated just above and to the right of his right eyebrow. This scar was peculiar for one reason; it was shaped like a lightning bolt.

This boy, Harrison 'Harry' James Potter, would be one of the most famous Magical to have ever been born. First off, he had been the one to vanquish the Dark Lord 'Voldemort.' The second, also how he vanquished Voldemort, was that he survived Avada Kedavra, the Killing Curse; a feat that had never happened before. For this, he was given the moniker of 'The Boy-Who-Lived.'

"Fine! But if those damned freaks come here, you'll be the one telling them, Vernon!" Petunia shouted as she began to prepare for the day. This included making food for her husband and herself, waking and feeding her son, Dudley, and getting herself and her son dressed.

As she was doing all this Vernon remembered something that his wife told him once, she had three brothers who all lived in America - the damn yanks as Vernon call them. But as he thought about it, if the freak needed a blood family member to look after him... But to make sure, Vernon asked, "Pet, dear, didn't you say that you had three yank brothers, and your birth father was a yank?"

"Yes dear I did, why?" asked Petunia. As she thought back about her brothers, she never did get along with them like her so called sweet sister did. Their father, Maxwell Tennyson, was in England in the late fifty's where he had an affair with her mother and nine months later she was born. But during her birth, there was a problem and her mother wasn't able to have any children anymore.

Then a year later, her father returned to England, her mother had married the man she thought as her dad, Matthew Evans. Her birth father had came to see her mother, and he brought along her freak of a half sister Lily with him. After learning about her mother not been able to have children again, they had a long talk and it was decided that Lily could stay with her mother and dad, so that she wouldn't be alone.

So over the years, her birth father and her brothers kept in connect. And over the years, Petunia and Lily were close, that was until she learnt that her sister was a freak and so parted over time. It got so bad that when Lily finished Hogwarts, she left home and never talked again. Up 'til now there was no reminder of the freaks, but now here was her freak sister's freak son and she wanted nothing to do with him, so she wondered what her husband was thinking.

"So I thought you could call upon one of those yank relatives of yours." Vernon said.

Petunia decided the idea had merit; let her relatives look after the freak instead of her and her normal family. "That's a great idea dear." Petunia said with a smile, "I'll call my birth father now and see if he can come get the freak." And with that decision made she made the phone call to her birth father.

o0OoO0o

9th of November 1991

A week after Petunia made the call to Maxwell Tennyson, explaining the situation, time had passed relatively quickly. There was a slight hiccup when Vernon wanted to put the freak in the cupboard under the stairs. Petunia had wholeheartedly agreed that that's where he belonged, but with Maxwell Tennyson dropping by at any time she couldn't allow it. As she told her husband her birth father knew people that could make their lives difficult should he find Harry mistreated, so Harry slept with their son in the second bedroom.

It was a crisp Saturday afternoon of the ninth when they got news that Maxwell was in the county on business and so he could pick his Grandson up that day. It was two o'clock when a knock was heard at the door. Vernon was at work that afternoon and Petunia was waiting for Maxwell, so she was prepared already and didn't have anything she needed to put aside to answer the door. As she opened the door to see her birth father there, Maxwell - or Max, as he liked to be called - tried to hug his daughter, but Petunia pulled away.

"Oh come dear won't you give your dad a hug?" Max asked his daughter sadly as the two stood in the hallway.

"You might have helped to give birth to me but you're not my dad." His daughter replied scathingly, "Matthew Evans was and always will be my dad, to me you're a stranger. Now let's hurry this up so you and the... boy can leave as soon as possible."

Max looked sad at this, after all this time his daughter never forgave him for the past, and by the looks of things still hated things that weren't what she called normal, if he was reading the slight pause right. 'If only she knew the truth about the world and what is out there.' Max thought sadly. "Are you sure about this Petunia, he is your sister's boy after all." Max said as he tried to change her mind, "Are you sure you don't want to -"

"I don't want anything to do with my freak sister's brat of a son nor her world." Petunia spat, "If it wasn't for needing to get rid of the boy I wouldn't even want anything to do with you. You know full well how I feel about her kind, the freaks of nature, only God should have that kind of power."

Max sighed sadly, honestly ashamed of her small mindedness, "But they're just normal people like you and me. They were just given a gift at birth to do something special. If only you would open your eyes and see -"

"I don't want to see anything!" Petunia sneered, "Nothing you can say will change my mind about my freak of a sister and the unnatural world she lived in. So just take the boy and leave, I don't want to spend another minute with the reminder of it in my house."

Max sighed again, and considered trying to argue further, but ultimately knew it was useless. Petunia believed everything that should be normal and everything had its place, never knowing the truth of the world and that the so called Wizarding World was just the tip of the iceberg of what was really out there. However, knowing that it was pointless to argue with his daughter, decided it was the best to leave it alone, "Fine, I'll get Harry and leave. Is there anything that I should know before I leave?"

"I told you everything that I knew over the phone," Petunia said bluntly, "now just get the boy and leave!"

So without another word, Max nodded and Petunia lead him with to the leaving room where Harry was in an old beat up crib by himself. Max once more felt a wave of shame as he saw Dudley in another crib, the Dursely child's was clearly brand new and quite expensive, while Harry's looked to be taken from someone's rubbish bin.

In the end he was just grateful Petunia did end up calling him; he didn't even want to think what would have happened to the poor boy if he stayed here. He knew just which of his sons he was going to give Harry to, to look over. Carl, he and his wife lost their son Ben a few months ago after he had a bad case of flu, and Ben was about the same age as Harry. Max thought that having Harry in their live would help them help and recover from losing Ben. As he picked up the young wizard, he smiled as he saw that even at a young age he looked like his father, James Potter, but had the Tennyson's green eyes.

After giving Petunia a sad goodbye and telling her if she ever needed him no matter what it was, he would be there as fast as he could to help her, he left the household. In unknowingly doing so, changed the fate of Harry and the rest of the Wizarding World.

TO BE CONTINUED!

Author's Notes: Here ends the first part of this new crossover story, I hope you like it. Now that you spent the time to read this story, could you spend a few minutes to review and let me know what you think of the story? Like it or not, I would like to hear what you think and what you would like to happen next. So you know though, I have the first few chapters already done, and they more or less follow the Ben 10 story line with a few changes along the way, I hope you like them. Once again, please review!