I do not own Ben 10 or Monster High I'm just doing this cause somebody need to make another crossover between them so if you reading this creature master I hope you like it.

In Outer Space

Our favorite alien shape shifter Ben 10 had come face to face with Vilgax his rival that was going to destroy the Earth with his laser cannons on his ship and his troops. Ben however turn into an alien with his entire body has a black exterior with green stripes that resemble circuitry all over him. A green circle on his head is his eye, that light up when he talks, the Omnitrix symbol is on the ring of his eye. After the bright light of his transformation is gone he was Upgrade to destroy the remaining troop's ships by controlling one of the ships blasting lasers and missiles at them, now heading to Vilgax's ship to save the Earth before it was destroy. But he got hit by a missile on his engine "Aw man!" he said in robotic tone when was going down and crash landing into Vilgax's ship on the lower floor destroying through the engine room and stopped on a battle arena inside the ship turning back to human when it timed out. Now Vilgax's called a lot of remaining troops of robots and Bounty Hunters 66 and 77 to take him down while he was weak.

Recovering from the crash land he got up slowly with bruises on his arm and was surround by robots and bounty hunters on a big screen holograph came to him it was Vilgax with an anger temper. "Give up the Omnitrix! or Watch your planet get blow to pieces!" He said, "I will never give you it. It's hero time!" Ben said, when he activate his watch with a green light was bright enough that no can't see him shortly. Turning him into a vampire-like alien with greenish-white skin and sharp yellow teeth. Wearing a black and green jumpsuit, that was a similar-what chest plate of a different alien. He wears black gloves with green fingers that are sharp claws, having green markings on his suit, and wears a mask with spikes on it with the color green. "Whampire!" he said, "Well at least the sun is not up," the troops are ready to fire at him but he shot two Corruptura's at the bounty hunter's heads and told them "Get them boys!" Following to his command they destroy the rest of the troops while the rest of them got on Ben trying to beat him to death but he made a sonic explosion that destroy them all. Now he tells the bounty hunters to leave the ship and they did by going into two escape pods out of the arena and blasting to deep space. "Now to deal with the cannons on Vilgax's ship." He said by hitting the Omnitrix for a helpful form to get the job done. Feeling muscular, taller, and his skin color is light green. The face color is yellow, red, and orange. He has no pupils in his eyes, chin is more visible, hands are now colored black, with yellow claws and a yellow hole to unleashed his flame powers. Having six red horns with yellow spots, two on each forearm and one on each shoulder; as well as a green horn on each foot, knee, and elbow. Now has a large collar raised up around his neck and the Omnitrix symbol on his stomach meet the new improve Swampfire. He saw a map that show him the direction for the cannons on the ship now flying there by using the holes on his hands (like Iron Man) shooting a hole in the battle arena with one of his hands to make a fireball, flying through it, entering the ship's hall as fast a motorcycle, and blast another hole made it to the cannons in central station on the ship before they launch plasma blast-like nuclear bomb in 30 seconds to earth quickly he thrown down two seeds in each of his hands.

For doing that he put out green gases on his hands to grow giant vines making a tight squeeze to destroy the cannons in 20 seconds exploded from the pressure from the vines. "I'm coming for you Vilgax." After saying that the Omnitrix timed out on him. "Really Omnitrix! Right now!" He said with anger, but Vilgax activate the ship safe defense mode when he had enough of Ben trying to ruin his ship. "Intruder Alert! the ship yelled, putting lasers, missiles, and flamethrowers surrounded Ben. "Come on! Come on!" He said until the Omnitrix turn green "Finally" he said, hitting it without knowing what alien he pick. His body was like a phantom, having four wings, and two antennas. Making them form a hooded robe on his body and a mouth full of teeth that don't move. The body color was blue with black and white spots on his arms and legs that resemble ice chunks, with a light blue torso, and large green eyes. His upper body is muscular then the lower body, having four fingers, two toes, and a third toe-like extension on his ankles. Now having larger eyebrows, sharper ears, and the Omnitrix symbol-like belt on his waist. "Big Chill!" he yelled, "Now it's time to chill out," breathing ice on the ship's weapons that will break free for a short while. He then turn himself intangible to fly to the top of Vilgax's ship to face him while surviving the ship's weapons that broke free from his ice breath move shooting at him, but the weapon's projectors turn froze when it hit right through him. "Just wait until he gets the bill for his ship." He said, laughing a short while then reaching to Vilgax's throne room.

Now in Vilgax's throne room, Vilgax has been sitting on his throne chair waiting for his rival to fight him, but Ben show his face by freezing his floor while still intangible. "Man you should make a better safe defense mode on your ship Vilgax " Ben said, when getting close to Vilgax but forgot he still has the glove that he hate so much. "When will you learn Ben that I know all your alien's weaknesses" he said, while throwing him to the top roof of the ship in outer space "Blah blah blah let's get this over with!" Ben said, with annoying tone hitting the Omnitrix, his entire body full of fur with sharp claws and teeth. Have three sharp toes on his feet, dog like ears, muscular body, and a tail. "Blitzwolfer!" he yelled, "How about this one." He taunt Vilgax, while he was delivering the first blow but Ben dodge it and gave a counter attack, then punch him in the stomach and open his mouth like four to send a powerful howl to his face sending him not far from the nose of the ship. Vilgax was getting up like it didn't hurt him, then he shoot his heat vision at Ben but he block it by tearing a shield like piece of the ship, that had melted when he use it for protection from Vilgax's vision, then he punch Ben's chest leaving him a bit clumsy from that blow, after that his watch started to glow giving him another form. His size was small as Grey Matter, his skin color turn yellow, then growing a beetle horn, bug like mouth, and four legs. "Aw man! I'm Ball Weevil now am going to get step on!" Ben said in a light voice, but a light bulb came to his head "Ooh Vilgax come an get me you squid face." Ben said, leaving a trap for him, without a moment the lose Vilgax has charging him like a bull, then Ben spit out a plasma balls at Vilgax's feet making it flat and sticky when got on the ground "That all you got." he said laughing, "You forgot one thing about this form. My goo explode on impact." After saying that he ran to a crack on the nose of the ship before left a big mark on the ship, while Vilgax's was blown away from the blast. "This isn't over Tennyson!" he yelled, before he was gone into deeper space. Ben got out of the crack and says "The Earth is save once again from me."

Then all of a sudden a Wormhole came in front of Vilgax's ship sucking at all the scrape metals and later torn a small amount on the left side of the ship. "Oh no!" Ben said, before seeing the last escape pod open. He quickly run to the last escape pod on the ship, while it was ripping apart piece by piece. But it was to late the gravity of the hole was strong enough to let his body fly to the hole "Goodbye Universe!" he yelled before it closed when he got in. There was nothing in space just only a half tore ship that's crash landing to the moon and was destroyed on impact leaving dozens of pieces on the moon.

In Twyla's house

In this house it's full of dark colors reminding your are in a haunted house for Halloween but there were these teenage girls spending time there. But these girls are different from normal ones instead they are monster-like girls. One of the girls has a golden scales on her body, with feather-like tail, Twyla put the shadows of nightmares back in the box she and her ghoul friends were talking about there projects for tomorrow. "Well is everyone projects are finished for today." Frankie said, everyone nodded except Cleo that didn't do her project at all "Cleo you know you should finish your project before tomorrow. It's the wise thing to do." Jinafire said, "I had to agree." Clawdeen said, "You won't pass Mad Science by doing nothing the whole time." "Oh ghouls don't worry about me. I've gotten one of my curse rituals to help me pass." Cleo said, but a moment to soon it broke apart in pieces "Now how can I get an A in Mad Science." She said, "Well is not like it's going to fall out of the sky." Clawdeen said, before all the ghouls look up seeing a portal coming down to them "Quick everyone to the kitchen before it gets us." Twyla said, in the shadows so everyone ran to the kitchen until the portal was gone in the living room.

Out the portal came Ben Tennyson screaming in a light voice hitting the coach and the floor "Man I should've gone XLR8 while I was on the ship so I can escape there in that pod." He said, in his head "What I'm still Ball Weevil." He said by being quiet it and looking around his surrounding seeing nothing but black and other dark colors "Something tells me that I am not alone in this house." He said, scared a bit of this he hid under the coach thinking he would be safe there,then after he went under the coach he felt something grab one of his legs forcing him to get out of the coach he tried to out run it but it was too strong. After a five second pulling him out he saw a girl but she is no ordinary girl she is a werewolf with brown fur, pink like red long hair, wearing a black shirt and long-like jeans she almost like a human except with the teeth. "Hey ghouls guess what I found!" She yelled, getting them attention so they got out of the kitchen and see what's she is carrying. "What is it Howleen!" Clawdeen yelled worrying about what she is carrying in her hand "I don't know but it's so cute!" Howleen yelled excitement then out of no where came Twyla getting out of the shadows to see the creature. "Aw your right, it is cute." She said petting it on top of the head getting annoyed by this he wiggle himself out of Howleen's hand landed on the coach everyone except Jinafire was surprised so they move a step back knowing that it would try to bite them.

"What are you doing Jinafire step back, before that bug bite you." Clawdeen said quietly not trying to spook it "Yeah you don't know that thing has venom." Cleo said quietly too "Don't worry I got this under control." Jinafire said quietly with them before getting close to catch the alien dug beetle not liking this Ben run for his life in the maze-like house she and the other ghouls run to catch the bug before it does something regretful in Twyla's house. Ben open one of the many doors in the house the door he open was Twyla's room it has dark an there with candles on a counter table that is old fashion, a large mirror, pictures on the wall with monster-like humans on them a bed with two pillows, covers that are dark blue, and a closet that so dark can't see nothing doing something he wish never done he got in hiding in the covers on the bed in a girl's room "Why Universe why?!" he said feeling a shame at being in this room not far behind the ghouls enter the room thanks to two of their ghoul friends that are werewolves got his scent like a Blood Hound searching for there owners prize animal that they shot wounded or killed. They know he is hiding in the covers of the bed so they let Jinafire do the rest beause they don't know if the bug has some kind of safe defenses mechanism that can ruin their style of clothing and hair color. She got a bug size-like jar that Twyla gave her out of the shadow of her closet while staying there not in harms way. When Jinafire was close enough to catch it all of sudden it got out of the covers to see what their doing he was upset at seeing a jar so he has no other choice but to talk to the dragon-like girl. "Whoa whoa whoa! There is no way I'm going in that jar." Ben said Everyone was in shocked including Jinafire and yelled "It can talk!" after that the other ghouls gotten closer to ben waiting for him to talked "Well yeah." he said "But why didn't you say anything when you being chased." Jinafire asked politely to the dug beetle-like alien. "If your my size you need to run to creatures that are much bigger than you." He said trying not to tell them that he's not afraid of there appearance but there size.

"Sorry we didn't mean to scare you." Frankie said calmly to the bug making him thank that she and her friends won't harm a fly. "Yeah we won't hurt you were sorry." Howleen said feeling sorry for scaring the little guy when she pick him up with her hand when he was hiding under the coach earlier."Apology accepted don't worry about it." He said trying not to make them feel bad about it than a beeping sound went on "Not to be rude but what's that beeping sound and why is your badge turning red." Cleo said looking worried at his chest seeing it going crazy turning red and green and sounding like a alarm goes on. "Aw no." he said calmly trying to not to yell right in front of monster-like girls but now he has other problems like if these girls see him as a human what will they do to him and will they still be friendly to him without the moment to lose he told the girls move back and block there eyes. They didn't know any big bright red light coming from the bug when Ben told them to uncovered there eyes they were in shock to see a 11 year-old boy siting on Twyla's bed they didn't talk until Ben yell seeing his reflection on the mirror "No this can't be I'm back as a kid!" Then the ghouls except Frankie yell "Your a normie boy! "Wait so you telling me that your much older and you are a normie. Frankie said in surprise of seeing a bug that turn into a human just like Jackson when he turns into Holt while listening to music. "How did you turn into that bug did you use any curse rituals. " Cleo said wanting to know so she can use him as project for Mad Science to get an A. "No I turn into him with my watch and his name is Ball Weevil." Ben said and thinking what she's saying about curse rituals.

"Aww that's a cute name." Howleen said remembering the bug and Twyla has to agree with that statement too while she was sitting on the bed next to Ben he was feeling a little sick about this but he ignore it. "So what's your name." Jinafire asked nicely to the normie boy "Ben Tennyson is the name." He said ready to know all the girls so he could make friends with them from this Universe."My name is Jinafire daughter of the Chinese Dragon." She said before taking a bow to the boy while the other ghouls gave their names out. "Name's Twyla daughter of the Boogey Man and no I don't give you nightmares instead I eat them." Twyla said shyly cause she want's Ben to think that she is not one from the make believe stories they told about her kind because a boy like him would be afraid and run for there live but she was happy when she got a handshake from Ben. "I'm Clawdeen Wolf daughter of the Werewolf including my young sister Howleen." She said while Frankie shake his hand and smiling "The name is Frankie Stein daughter of Frankenstein it's so glad to meet you." "Don't forget the princess of Egypt me Cleo De Nile daughter of the Mummy." Cleo said with a royal tone "So what son of monster are you." "I'm not no monster I am a normie like you ghouls said and I'm not from this world." He said trying to cooperate before everyone was shocked again "So your telling us you are from that hole poor guy." Twyla said patting Ben in the back "Your telling me that you are just an average normie with a watch that turn's you into creatures from your world. Claw-some!" Howleen said an excitement "Can you show us one of your forms please." she said giving Ben the puppy eyes he can't say no to those eyes so he said "Yeah I will show one of the creatures from my world." So he activate his watch to see holographic on it select an alien and bam hit the watch a big bright light blinded the ghouls for a short time to turn into Big Chill instead of any of his old aliens. "Wait how can I get Big Chill when I'm 11 years-old? Probably the Wormhole didn't change much of me." He said I his head while the ghouls was surprise to see him turn into a moth humanoid "Oh my Ra! You kind of remind us one of the hybrids in Monster High. Would want to join there?" Cleo said "I don't thank is wise to bring a 11 year-old normie to Monster High that transform to other creatures. But if he is smart enough for Monster High then everything is going to be fine." Jinafire said worrying that Headmistress won't not like this. "I would like to join Monster High." Ben said not knowing no where to go "Well it's settle then were taking you to Monster High." Cleo said with a royal tone "This won't be good." Jinafire said.

Will Ben make new friends or get in trouble with the Headmistress in Monster High? Find out the next chapter the weekend or longer but wait patiently and I case I forgot to put in the some details on the first one tell me.