Welcome everone to my very first Crossover. Before the we get started, I wanted to point out something I noticed while watching "A Tattler's Tale." When the kids freeze during their brawl and Lily is biting Luan's leg. Lily's right ear is missing. Check it out its really weird.

Disclaimer: I do not own Ben 10, The Loud House or any of their characters.

L.T. Lily Terrestrial

"Lincoln Loud here," the white haired boy introduced himself as he walked down the street. "To the outside world, the only things strange about me are my white hair, and the size of my family." Holds up a wallet photo of the Loud family. "But what people don't know, is I'm actually, a superhero!" He raised his right arm showing the Omnitrix attached to his wrist. "The Omnitrix, it fell from space and from the moment it jumped onto my wrist, I've had the ability to transform into super powered aliens. I've fought criminals, robots, mutants, monsters, alien invaders, you name it. My life is a regular heroes story, but," he stops walking. "This story isn't about me, its about one of my sisters." He held up the photo again. "More specifically, Lily." He pointed to the smiling baby. "Your probably wondering what a fifteen month old has to do with any of this, well it's a long story."

With the long history of noise coming from the Loud house, the neighbours try to ignore the noise. This means no one saw the large, red skinned, four armed alien fighting some kind of robot.

"You picked the wrong planet!" Four Arms said before punching the robot back.

"You tell em son!" Lynn Sr yelled as he Rita, Lori, Leni, Luna, Luan, Lynn Jr, Lucy, Lana, Lola and Lisa were watching form the kitchen.

"Take him down bro!" Luna shouted.

"Take him apart!" Lana shouted.

"Save me some intact pieces for study!" Lisa shouted and everyone gave her a look.

The robot got up and its chest opened up, revealing a glowing green power core. It glowed brighter and it blasted Four Arms. "LINCOLN!" They all shouted. Gritting his teeth Lincoln pressed forward towards the robot as it blasted him. Once close enough he reached out grabbing the power core and began crushing it in his hands. An intense light forced the family to cover their eyes as moments later there was an explosion, no one noticed a bolt of green energy fly in through an upstairs window.

They all looked at the smoke biting their nails in worry, until Lincoln walked through the smoke. "One robot for the junkyard."

His family cheered for him as he entered the kitchen. "Great job Lincoln."

"No problem." Lincoln said. "On the evil robot scale, that was like five. Now if you'll excuse me, I'm meeting Clyde at the comic book store, later guys." With that Lincoln took his leave.

"Wait," Rita said and quickly counted her children, "wheres Lily?"

"I left her in her crib." Leni explained. "I thought it might be dangerous to bring a baby to see Lincoln fight an evil robot."

"Huh, that's actually good thinking Leni." Her father said in surprise.

"I'll check on her." Lori said before heading upstairs.

"If you excuse me family unit, I must see if any components of that unknown robot are salvageable."

"AH GUYS!" Lori called from upstairs. "You might wanna get up here!"

They all rushed upstairs to Lisa and Lily's room to see Lori standing over the crib with her back turned to them. "Everything okay Lori?"

"Look!" She turned around holding out Lily to them. She looked fine at first, but then they noticed the mini Omnitrix symbol on her bellybutton. It looked exactly like it did on all over Lincolns transformations, but instead of green it was lavender like Lily's blanket.

"Check it out," Luna pointed. "Lil sis got some belly jewellery. Hey since the youngest of us got it, could I?"

"Finish that sentence and your grounded until your forty." Her mother warned.

"Harsh," the young rocker said.

"Not to worry siblings and parental units." Lisa spoke up. "For I have created a scanning device, that should enlighten us as to the nature of this anomaly." She got up on her stool to her lab table. "Strange, I left the device here this morning."

"Um, about this big?" Lynn Jr held up her hands, "kind of looks like TV remote had a baby with one of those pricing guns stores have?"

"Why yes," Lisa narrowed her eyes. "How did you know?"

"We took it," Lynn Jr, Luan and Lana said.

A few minutes later they were all in the living room as Lisa scanned Lily with the device.

"So why did you three take it?" Lori asked as she held Lily.

"We wanted to see what was that jar of purple stuff in the back of the fridge was." Luan shrugged.

"So what was it?" Lola asked.

"We don't know." Lana shrugged. "The scanner thing couldn't tell."

"Jar of purple stuff?" Lynn Sr blinked. "That's still there?"

"When did you but it?" Lucy asked.

"We, didn't." Rita said. "It was there when we moved in."

"Eww," the girls said.

"Scan complete," Lisa said.

"Lily looks okay." Luan said as Lori placed the infant on the floor.

"Hmm," Lisa looked over the results as she and everyone else moved a towards the stairs. "Its very similar to the scans I took of the Omnitrix while our only male sibling was asleep."

"You scanned Lincoln while he was asleep?" Lynn Jr asked.

"Of course, I conduct all my scans while you are all asleep." Lisa said casually.

"What?" they all gasped.

Suddenly there was a flash of green light behind them. Lucy seemed to be the only one to notice and when she turned around, she gasped. "Guys!"

"As I was saying," Lisa went on. "There appears to be some kind off signal that connects it to Lincolns Omnitrix. Though for what purpose I'm not certain."

"GUYS!" Lucy shouted to get their attention.

They all turned only to scream, Lily was on fire. "MY BABY!" Rita screamed.

"Wait!" Luna yelled. "Look!"

The fire went down and they gasped. Sitting there was Lily, but made of magma and her head was on fire. "Poo-Poo."

"Is that," Lana blinked, "Heatblast?"

"Fascinating," Lisa said. "Our youngest sibling appears to have been transformed into an infant version of one of our male siblings transformations."

"Forget your dumb science talk." Lola snapped. "Lily just turned to one Lincolns aliens!"

Lily heard her name and looked at her family, not noticing the shocked expressions on their faces. Smiling she got up and waddled towards them, leaving tiny scortched footprints in the carpet. The family screamed before scattering and running away from Lily, who thought they were playing and chased after them.

"Somebody do something!" Luna screamed.

"I know!" Leni grabbed two of Lily's blocks from the floor. "Look Lily, its your blocks."

Lily grabbed the blocks, narrowly avoiding burning her sisters hands in the process, but the blocks caught fire. The infant giggled happily, bringing the burning blocks together before tossing them in the air. One landed on the couch and the other on a chair, both of began burning.

"Laughing as you burn the world." Lucy said. "This will make a great poem."

"Somebody do something USEFULL!" Lola snapped.

"I got it!" Lana skidded to a stop and ran into the kitchen. "Wait for my signal!"

Lily began crawling along the floor leaving more scortch marks in the floor before stopping in front of the window to look at a butterfly that was fluttering outside. "Ooohhhh."

Lisa used this distraction to move closer. "Fascinating. Her motor skills appear to be at the same level as when she was human." She wrote on her notepad. She then noticed her little sisters bare, magma behind. "It would seem that while Lilys diapers can contain her highly toxic fecal deposits, they could not withstand the heat of her new body. Lily giggled as she watched the fluttering butterfly, but then felt something in her tummy causing her to close her eyes. A loud fart got everyones attention, but not as much as the flames that accompanied it and scorched Lisa's note book. "My notes!" The butterfly flew away and Lily resumed chasing her family.

"Somebody lure her in here!" Lana called out from the kitchen.

Lily approached her parents who were backed into the corner and shaking in fear. "Hey Lily!" The infant turned around and saw Lori who held her arms out, "come give your big sister a big hug."

Lily smiled and waddled towards her oldest sister while the parents let out a sigh of relief. Once Lily entered the kitchen Lori jumped to the side and the baby stopped in confusion when she saw Lana standing by the pipes under the sink with a wrench in her hands. "Sorry Lily." Lana pulled the wrench and water shot from the pipe hitting Lily and washing her back into the living room.

When the water was shut off Lily was on her back, flames extinguished and crying loudly. "WAAAHHHH!" But instead of tears, little puffs of steam were coming out of her eyes.

"Oh sweetie," Rita picked her youngest child up. She was still hot, but a pleasant non burning hot. "Its ok, sweetie," she held her close, "Mommys here."

Lynn Jr ran in with a fire extinguisher and put of the fires. "Fires out."

Lori looked around at the damage. "Not the worst fire the living rooms ever seen."

Luan inspected something on the floor. "I think I found whats left of Lilys diaper. Guess she was on a hot streak, get it?"

The family groaned except for Lynn Sr who tried to contain a chuckle.

"As I was saying," Lisa adjusted her glasses. "This mini Omnitrix-"

"The Lilytrix." Luna spoke up.

"I like it." Lucy said.

"Fine, this Lilytrix," Lisa carried on, "is linked to our male siblings Omnitrix. In such a way that when he transforms into and alien life form, Lily does the same."

"Awesome!" Lana smiled.

The baby in question was still crying puffs of steam. "Its okay Lily," Her mother kissed her forehead and the infant started to calm down. "Everythings going to be okay." Lily smiled up at her mother and everyone let out a sigh of relief, but were all unprepared when Lilys head reignited.

"AAAHHHH!" Rita screamed in pain as her hands burned before tossing Lily upwards.

"I got her!" Lynn Sr caught her and smiled, but lost that smile when he felt his hands burning. "AAAAAHHHH!" He tossed her to his wife who caught her, only to scream and toss her back to her husband who screamed before repeating the process. Lily was smiling and giggling, thinking they were just playing a game.

A few minutes later Lily was drinking her bottle, sitting on a special fire blanket Lisa made.

"Why isn't the bottle melting?" Lola asked.

"I created it to have a resistance to very high temperatures." Lisa explained.

Lori raised an eyebrow, "and why did you make a fireproof bottle?"

The prodigy shrugged her small shoulders, "I was bored."

"But now what?" Rita asked everyone. "Lily is a baby alien that might burn the house down, who knows when Lincoln will be back, and what is that noise?" Everyone turned to see Luna holding a pan of stovetop popcorn over Lilys head making the insides pop.

"What?" Luna asked as everyone stared at her. "I was cravin some popcorn."

"Well don't hog it all." Lynn Jr said.

Lily finished her bottle with a smile but then gained a strange look on her face and everyone leaned in closer out of curiosity. Lily then burped a large stream of fire on them, when it passed they're covered in shoot and their hair singed, making Lily giggle at them.

"Wow, that really burns me up." Luan laughed, "get it?" With that she collapsed.

Suddenly there was flash of green light and Lily was human again, "Poo-Poo."

Before anyone could question how, the front door opened, "I'm Home!" Lincoln walked in, but stopped when he saw all the burn marks on the floor and furniture, as well as his shoot covered family. "What I miss?"

And that was chapter 1. Like in the episode "Inspector 13" Which Inspired this story, Lily will transform every time Lincoln does. I figured since Heatblast was Bens very first transformation, why not have it be Lilys two. Some Aliens are hard to write a full chapter on without getting repetitive, so future chapters will a mini segment at the end. A funny scene involving that alien.