15 years ago,

Shredder held baby Miwa protectedly as she peaceful slept in his arms. He did something terrible. He made a deal with the devil in order to bring back his love Tang shen. But Saki could not for fill his deal and now he was gonna pay the price. He had to protect Karai with his life. He could not lose her... not again. He lost Shen to Hamtoa yoish, there was no way in hell he was gonna lose his little Karai.

"It will be alright, little one" Saki whispers to the sleeping baby.

Suddenly the door busts open and his foot siolders fall to the ground. Bill Cipher floats into the room. Shredder growls as he places Karai in a crib. Than the armor ninja exstands his gunlests.

"Hello Shredder" Bill Cipher greets.

"Bill Cipher" Shredder growls.

"You know I have been waiting for you to for fill our side of the deal but it's obvious you have failed" Bill Said.

"It's not my fault, Queen Moon got in my way !" Shredder argues.

"Excuses, excuses Saki" Bill said waving his fingers.

"You knew our deal, if you failed"

Saki eyes stared at The sleeping baby.

"No... No I won't let you take her !" Shredded shouts.

"She's the only thing I have left of Shen !"

Saki charges a Bill but Suddenly the armor ninja is smashed into a wall. Cries of little Karai causes Shredder to look up in horror. Bill held Karai who was wide awake and crying for her father.

"No, no please she's the only thing I have left" Saki begs.

"Well Saki since I'm not a curale man I'll let you see her once she turns 16" Bill smirks before he disappears with Baby Karai.

"Forgive me Shen" Saki whispers.
*************************************************

Somewhere in Sokvia,

Four year old twins Pietro and Wanda Maximoff played catch with a red ball. Wanda giggled happily as her twin super speed for the small ball and brought it back to her. Pietro was a mutant that was born with powers. And that powers was super speed. He loved using  his powers and so did Wanda. She loved it when he gave speedy piggy back rides. Thoses where thrill rides for the them. It wasn't clear if Wanda got powers as well but she seemed like she was a normal  human. But beside this the twins where close and inseparable. Nothing would ever change that or so it seemed...

Later that night,

Wanda and Pietro where having dinner with thire father. Pietro was munching on spettgatie at a fast rate. Suddenly there's a knock on the door. Thire father goes to the door and answers it. There where five men dressed in suits.

"May I help you gentlemen" The father asks in a thick accent.

"Yes we are here for very dangerous mutants and we believe they are living in your house" One of the men explains.

"Wait do you mean my children ?" The father asks.

"They must come with us, the children are very dangerous and they must be contained, especially the girl" The second man said.

"No, there just children !" The father shouts at the men.

"Sir please, stand back" The third man warns.

"I won't let you take them !" The father shouts as he punches on them men.

The forth men takes out a tazer and shocks the father. He let's out a cry of pain before falling to the ground.

"Daddy !" Pietro and Wanda scream in fear.

Pietro felt his blood boil. No one hurts his father and gets away with it. The men enter the house

"Wanda hide" Pietro whispers.

Wanda shakes her head, tears streaming down her eyes. Pietro hugs her in comfort. The men approach them with guns in thire hands. Pietro growls at them as Wanda whimpers holding tightly  onto her brother.

"Your coming with us" The first man said inching closer to the twins.

Two of the man pull out clothes and runs up to the twins, the first man grabbing Wanda and placing the clothe over her mouth causing her to past out.

"Wanda !!!!!!" Pietro screams tears streaming down his face.

The second man grabs Pietro and places the cloth over his mouth. Pietro struggles feeling himself getting weaker and weaker as he sees his beloved sister being carried away. Tears ran down pietro's cheek as he screams for his sister before the young boy passes out.

The man carries Pietro out of the house and into an allyway. The man was ready to put the boy in the back of the van until he heard a roar.

Suddenly tiger claw attacks the man who drops Pietro in the process. Tiger claw strikes down the man and grab the boy. Tiger claw  Smirking know Bill wanted the boy. Tiger claw disappears in the shadows taking Pietro with him.

**********************************************************

Note- So that's how Karai and Quicksliver joined Bill's side. In this Karai and Quicksliver are Sergeant brother and sister.