A/N: This mainly happens when Ben was 16 years old.
16 Years Ago...
"You demon! Get out! Get out!"
A horrible person had entered into Ashley's (Ben's mother's) life, she had been tempted by her now ex-husband Bob to do "it" with him. And now, Bob was being sent away for "deflowering" Ashley.
"I'm very disappointed in you Ashley, I can't believe you would let him do that to you! And what's worse, you agreed to do it with him!"
"I-I'm sorry!"
"From now on, you're on your own!"
Of course, Ashley's parents did help her. Her father only said what he said out of anger, but when Ben was born he and his wife helped her take care of and raise him. Soon, Ben grew into a young boy. But the history of his father remained.
16 Years Later...
Ben had just found out the history of his father, and he didn't like it. He was sad of course, but Gwen and Max helped him get through the pain of this discovery. And he didn't let it affect him that much anyway, it was all in the past. What mattered was the present and the future that he could make.
"Ben, I know the history of your father was... not the greatest. But we just want you to know that what happened in the past doesn't matter. What matters is that you make a good future for yourself."
"Thanks Gwen, grandpa. You guys have been supportive, and I can't thank you both enough for that."
As Ben thanked Max and Gwen, he looked outside. He wondered what happened to his father.
Meanwhile...
A certain black-haired man with eyes of the same color was working on something in a deep, dark cave. It sort of looked like the original Omnitrix from Ben 10, but with a brown color and weird things that protruded from it's sides. It was called the "Antitrix", and it was his latest creation.
"Now, to just add this piece and..."
FLASH!
"Perfect. Hahahaha! My former son definitely had the right idea when he kept that thingamajig."
-It was Ben's father Bob! He was the one who created the Antitrix. After it was completed, he put it on. A huge flash of red appeared after he did.
FLASH!
"Finally, after 10 days. I finally completed it! The Antitrix! All power belongs to me!"
Bob started testing out the Antitrix, he twisted its dial before slamming down on it.
FLASH!
Black fur started to grow all around him, before his body became big and burly. His eyes grew a scary shade of red and his teeth turned into sharp ones. This was followed by metal ones appearing before the real ones and the Antitrix popping up on his chest.
FLASH!
ROOOAAARRR!
"Bashmouth!"
The first form that Bob turned into was called "Bashmouth", in this dimension he's a mutated loboan (Benwolf's species). He growled and roared, before rushing out of the cave.
Some Time Later...
The Tennysons were just having a good time at Biggie Box, when
CRASH!
ROOOAAARRR!
Bob crashed in! But they didn't recognize him yet. They wouldn't recognize him in the form he is in now. "Wh-What the-?!" Gwen ended up saying in shock, just then Bob growled "Ben Tennyson..." while drooling creepily. Gwen and Max were scared and disgusted, they were also shocked that the creature knew Ben's name. Then, Ben said "It's hero time!" before slamming on the Omnitrix.
FLASH!
"Cannonbolt!"
Ben turned into Cannonbolt, before curling into a big ball and rolling super fast towards Bob. He made him crash into some shelves weakening him a bit, but then...
FLASH!
"Skunkmoth!"
SPLAT! SPLAT!
"AGH! GROSS!"
After Bob was crashed through some shelves, he turned into his own version of Stinkfly called Skunkmoth. He sprayed acidic stinky sludge at Ben, making him yell in pain and say "GROSS!'. The sludge burned his skin a bit, and it was painful. Just then
FLASH!
"Fourarms!"
BAM!
"AGH!"
Ben switched to Fourarms and sent Bob flying with an uppercut with all four of his fists. Bob crashed through even more shelves, before crashing onto the floor.
CRASH!
"Ungh..." Bob groaned as he tried to get up, but was a bit too weak to do so. Just then, Ben tried smashing him into the ground. However...
"RAAH!"
SMASH!
FLASH!
Bob turned into his version of Upgrade called "Bootleg". He liquified himself, before solidifying himself behind Ben and punching him on the back of his head hard.
BAM!
"Agh!"
Max and Gwen tried to help, but Bob was able to dodge their attacks and make them fall as well.
PEW! PEW! PEW!
FLASH! FLASH! FLASH!
FLASH!
"Oomph!"
"Agh!"
THUD!
THUD!
Max and Gwen were hit by Bob's huge eye laser, they ended up falling down on the floor hard. Gwen was bleeding a bit from her side from the laser. "GWEN! GRANDPA!" yelled Ben, before he switched to Upgrade and blasted Bob away from them.
FLASH!
"Huh?!"
FLASH!
"Oomph!"
THUMP!
Bob ended up hitting the floor hard as well, he got a bit weaker. He tried getting back up, but Ben blasted another eye laser at him. However, because Bob was trying to get up he accidentally hit the Antitrix instead of himself forcing him to change back into his human form.
FLASH!
FLASH!
"Wh-What the-?!"
"-HUH?!"
"-WHAT?!"
"-H-HUH?! N-NO! I-IT CAN'T BE! D-DAD?!"
"Ungh... cheap shot Tennyson. You won't be able to do that again."
"-D-DAD?! WH-WHAT THE-?! SINCE WHEN DID YOU- H-HOW DID YOU-"
Ben was shocked! He didn't expect the Omnitrix copy user to be his father! "Surprise, Ben! Ahahahaha!" Bob laughed, "How dare you show your face after doing the things you've done!" Ben replied angrily. "I couldn't really care less about what I've done." Bob replied back, before slamming on the Antitrix again.
FLASH!
"Hot Shot!"
Bob turned into his version of Heatblast named "Hot Shot". Then, he tried blasting fire at Ben. Ben liquified himself and was able to dodge the attack, then he switched to another form.
FLASH!
"Diamondhead!"
BANG! BANG! BANG!
FLASH!
"Humungoraptor!"
While Ben started firing crystal-like spikes as Diamondhead, Bob turned into his version of Humungousaur called "Humungoraptor". He was able to tank the spikes, before slamming his tail on the ground to send energy charged fire towards Ben and make him fall down.
ROOOAAARRR!
SMASH!
FWOOSH!
"Agh!"
THUD!
Ben ended up falling down hard, "How did I end up with a pathetic son like you?" Bob added. Then, he tried spewing energy-charged fire towards Ben, only to be stopped when Gwen yelled "Sonoris Bumbargos!" and sent huge waves of rushing water towards him.
FWOOOSH!
"Agh!"
Bob ended up coughing when water entered his mouth, his fire breathing ability was temporarily neutralized. This gave Ben the chance to turn into XLR8 and punch him in the face fast.
FLASH!
FWOOSH!
FLASH!
FWOOSH!
"Wh-What the-?!"
However, Bob saw him and switched into his own version of XLR8 he called "Rush" before moving out of the way in time. "Wh-What the-?!" Ben said, before looking around to see where Bob went. Just then
FWOOSH!
BAM!
"Agh!"
THUMP!
He ended up getting knocked down by him fast. He was now weakened a bit and was close to passing out, Bob had hit him really hard. "Ungh..." groaned Ben as he tried to stay conscious. "-HEY!" shouted Gwen, before she yelled "Asalis Lethiergos!".
FLASH!
FWOOSH!
Gwen tried using a spell that could slow Bob down. However, Bob was able to dodge it. She then tried using the spell a few more times, but every time she blasted it he kept on dodging. Then
FWOOSH!
"H-Huh?"
BAM!
THUD!
"Oomph!"
Bob went up to her fast before knocking her down with his tail at the same speed, this caused her face to develop a bit of a bruise. She was close to passing out as well, Bob had managed to hit her hard too. "Ungh..." Gwen groaned as she could feel herself weaken. "-GWEN!" shouted Max, before he became angrier and yelled "That's it! Why don't you pick on someone your own size?!" and tried fighting Bob. "Sounds good to me." Bob replied, before running around in circles and sending a speed tornado his way.
FWOOSH-FWOOSH-FWOOSH-FWOOSH-FWOOSH!
"WHOAAA!"
FWOOSH!
CRASH!
Max got sucked into the tornado and was sent flying straight into a shelf. It then fell on him hard. "AGH!" yelled Max as he was hit by the shelf. "Ungh..." Ben groaned again, before getting back up. Then, he looked towards Bob. "Hahahaha!" Bob laughed. Just then
FLASH!
Ben switched to another form. But when Bob looked back, he couldn't see what. In fact, he couldn't even see him. "You can run, but you can't hide! Hahahahaaa!" laughed Bob as he looked around for Ben, "Wasn't planning to." Ben suddenly replied. He then appeared behind Bob as Ghostfreak before phasing his hands through his head.
FWOOSH!
FLASH! FLASH! FLASH! FLASH!
"AAAHHH!"
Black and white flashes started covering Bob's vision as Ben kept his hands through his head. Then, he pushed them in deeper covering his vision in even more black and white flashes and weakening him more. Eventually, Bob was weakened so much that Ben could let go now.
FLASH! FLASH! FLASH! FLASH!
"AAAHHH!"
THUMP!
"Ungh!"
After Ben managed to knock out Bob, he switched back into his human form.
FLASH!
"Never. Never again."
"Ungh..."
"Ungh..."
"GRANDPA! GWEN!"
FWOOSH!
Ben then checked on Max and Gwen after they groaned.
Some Time Later...
Bob was taken away by the police, his Antitrix was disassembled as well. It turns out, one of the components he used to create it was one of Azmuth's inventions. -The Unitrix. It was modified and used as the Antitrix's core, but it was taken out now and reverted back to normal.
"Thank you Ben Tennyson for stopping your father. I'm sorry he wasn't the best father to you."
"Meh, I'm kinda over it already."
"Keep doing the right thing, Ben Tennyson."
"I will, thanks Azmuth."
FWOOSH!
After Azmuth left, Gwen and Max hugged Ben. Their injuries had already been healed, "Thanks for helping me with this battle. That was a tough one." said Ben, "Of course. We'll always be there to help you." Gwen replied. "Team Tennyson wins again!" added Ben, before pumping his left fist into the air.
Meanwhile...
Bob was taken into one of the plumbers' special cells and was locked up in there. "One day... you will regret this Ben Tennyson..." he said.
