I don't own Dragon Ball and Kimetsu No Yaiba Dragon ball is owned by Akira Toriyama and Kimetsu No Yaiba is owned by Koyoharu Gotouge. I also don't own Doctor who.
Chapter 1: Cruelty, trapped and change of fate.
Like two to three years have passed after the cell games. Goku who is dead in the afterlife is training towards getting Super Saiyan two on King Kai's planet. Then all of a sudden a wormhole opens up a Goku is sucked into it. King Kai goes 'Goku'! Oh no. He has been took too another dimension. Hmm but there was no negative energy! So I am guessing at was random wormhole. I hope that Goku will be alright.
Kimetsu No Yaiba Universe:
Nezuko is having bad dreams like they're passed memories. She dreams that she was a demon and her brother was a demon slayer. The dream ended with the final battle Muzan dying but managed to get a killing blow on her. The nightmares keep getting worse she gets closer to the day she becomes a demon. Tanjiro is worried about her and asks what's wrong? You know that you don't have to hide stuff from me. Nezuko responds saying I keep having that bad dream the same one every night. Tanjiro says bad dream what was it about? Nezuko says I dreamt that I was a demon and you were a demon slayer. My dreams were like multiple adventures. And at I died in this last dream. Tanjiro says a demon? Demon slayers?
Nezuko says well I hope that those dreams don't become real. Tanjiro says well I better get going I have to sell charcoal so we can have a feast at the new year. Nezuko says let me go and sell the charcoal instead. Tanjiro says its heavy with snow out here and I don't want you catching a cold. Also I am quicker than you. Nezuko insisted that she should go instead. Tanjiro says fine you win has he gives Nezuko the basket full of charcoal and helps get it on her back.
Has Nezuko sets off to the village after informing everyone that she's going to sell the charcoal instead. Tanjiro smells something a weird scent, wait blood someone must have came up the mountain and a gotten hurt on some ice. Tanjiro runs towards the scent and tries to avoid slipping on any ice.
Nezuko has just arrived in the village. Someone says oh Nezuko you came down today. I thought I would have seen your brother instead. Nezuko says he would have come but he has to move a lot of heavy stuff around. Nezuko noticed that she can part see some fog of colours which isn't has good has Tanjiro's sense of smell. Everyone in the village didn't mind Tanjiro's sense of smell or Nezuko being able to see colours like fog. A guy with a broken plate runs up to Nezuko and says I have been accused of breaking this plate. Can you be able to tell what broke the plate with your fog? Nezuko goes the fog colour tells me that it was a "cat"? The man says see I told you is wasn't me. The woman goes so a cat hmm. Multiple people asks Nezuko to help do multiple favours and see agrees to them.
Tanjiro arrives to the source of the scent and is shocked to see a guy unconscious laying in the snow. Tanjiro says he has a weird scent and why does he also have weird spiky hair. Tanjiro tries to lift the guy up onto his back to take him home and do his best to tent to the guys wounds along with getting help from his mother. Tanjiro says Jesus this guy weights a lot. Tanjiro managed to get back home. His family is shocked to see him carrying a injured person on his back. They try their best to treat the wounds.
The guy suddenly wakes up in a small panic shocking everyone. He calms down and says his name. My name is Son Goku and I am happy to see some people treating my injuries. Everyone tells Goku their names. They say their names are Kie Kamado, Tanjiro Kamado, Takeo Kamado, Shigeru Kamado, Hanako Kamado and Rokuta Kamado. Tanjiro says I am the oldest child in the family. My sister Nezuko the second oldest child is currently selling charcoal even know she should have been back by now. But the sun is setting so I guess that old man Saburo must have let her stay at his for the night.
Nezuko is walking back up the mountain she thinks (wow it's getting late). Has she passes an old house she hears her name. An old man says Hey Nezuko! You aren't going back up the mountain are you?! It's too dangerous! Nezuko says I can partly see colours of fog so I'll be fine. The man says you can stay here. Please. Come back. Nezuko says but. The man says it's alright. You're welcome here. You don't want to run into any demons. Nezuko says okay Saburo I stay for the night. Saburo says for ages... Man eating demons have roamed these woods after dark. So you shouldn't walk around at night. Eat, then sleep. You can get up and go home early tomorrow.
Nezuko asks but can't the demons come inside houses? Saburo says yes... They can. Nezuko asks so why don't they eat everyone then? Saburo says because demon slayers cut them down. Have for ages... Nezuko thinks (old man Saburo lives alone because he lost his family. He must be lonely. Next time I'll bring my big brother and little brothers. There's no need to fear. There's no such things as demons. But now that I think of it... My Grandmother said the same thing before she died. But wait I dreamt that I was a demon and my big brother was a demon slayer.).
At the Kamado house:
Most of the kids are asleep. Tanjiro and Kie are both getting ready for bed. Goku is worried about something because he can sense a negative ki approaching the house. Here hear a knock on the door Kie answers the door and a man wearing smart clothes and a hat says hello there I need a place to stay until the snow dies down a bit. Kie says it's fine come in. The man says his name is Muzan Kibutsuji and he also says well this is a big family you could like use a bigger house. Kie tell Muzan everyones names I am Kie Kamado and the children sleeping are called Takeo Kamado, Shigeru Kamado, Hanako Kamado and Rokuta Kamado. This is my oldest son Tanjiro Kamado. Goku appears and says my name is Son Goku.
Muzan sees the hanafuda earrings on Tanjiro. Muzan then starts to attack the Kamados but Goku gets in Muzan's way and says why are you attacking them all of a sudden! Muzan when hmm no human has hurt me like that with a punch before and you don't feel human and your not a demon too what are you. Goku says I am a Saiyan and Saiyans evolved differently from humans even know both races evolved from apes. Goku thinks (dammit my ki is still messed up meaning that I don't have proper control over my own power and strength!). Muzan managed to get passed and kill everyone else except Tanjiro. Muzan says Tanjiro was it where did you get those hanafuda earrings. Tanjiro being held my his neck says I don't know they were passed down through my family for generations.
Goku goes let go of him and face me. Muzan went well you failed to save anyone here. Plus I am going to turn his boy into a demon. Muzan puts a finger in Tanjiro's head and flows blood into Tanjiro and takes his finger out and says well now to deal with you. Goku goes you monster I am going to kill you! Goku goes in for a punch at Muzan's head but Muzan dodged. Muzan lands a bit on the back of Goku's neck knocking him out. Muzan got a smell of Goku's blood and is paralysed like he had to much to drink. Muzan thoughts (I can believe there is someone with ultra marechi blood he has like the nutritional value of 200 humans. But I haven't got the time to eat him, kill him or turn him into a demon.). Muzan left the house.
Goku is unconscious and Tanjiro is also unconscious outside of the house in the snow. Goku did come around and put Tanjiro outside encase he turns into a demon so he doesn't try to eat any of the corpses but passed out to his injuries and the cold. But before Goku passed out again he activated a beacon.
Meanwhile somewhere is space:
Well me and my companions have just saved a planet. Here we are back home at earth. Well we will see you later Doc. Yes Graham, Ryan and Yasmin I will see you three later. The Doctor takes off in the Tardis. Doctor hears beeping and checks the monitor. She goes wait this is Son Goku's beacon and it's not coming from his dimension it's coming from another dimension hmm. I might has well try to get to him and help him out.
In another Tardis. Well I am travelling alone again. I had to wipe Donna's memory of me so she can live. Wait is that beeping I hear. He checks the monitor wait a minute this is Son Goku's beacon and it isn't coming from his dimension it's coming from another dimension. Well I got nothing else to do so I am going to help him.
On both Tardises:
10th Doctor; What's wrong with you old girl it's like your trying not to go towards beacon. 13th Doctor; What's happening with you? It's easy to lock onto the beacon and travel to it. Both Tardises at the same time both made a big bang noise. What happened? What was that big band noise? 10th Doctor says wait this aren't my Desktop top. Who are you? Wait don't tell me your me? 13th Doctor says that's right I am you but what are you doing here?
10th Doctor says well I was just responding to Son Goku's beacon. 13th Doctor says well I was doing the same thing. 13th Doctor says well looks like we both are going to be working together. 10th Doctor says well then we better get going them.
Kimetsu No Yaiba Universe:
Nezuko is walking back home and stops. When happiness is destroyed it's always followed by a red fog. She starts running up the mountain. She gets back and sees Tanjiro laying on the ground. Nezuko runs up to him saying brother are you alright? She sees someone else unconscious and wonders who the stranger is. She them looks though the door and wished she hasn't she sees her families corpses. Nezuko then remembers her dreams and went so my dreams did happen I was a demon before and I have to live through it again but this time with my bigger brother is the demon with me being a demon slayer. Nezuko puts Tanjiro on her back and tries to make her way to the village even know she knew that she wouldn't make it and would have to deal with the Water Pillar.
Goku was just left behind. By the time Goku comes around he sees himself in the Tardis. Goku says Doctor you have came but what has happened to the Tardis? The 10th Doctor says well my Tardis and my future self's Tardis have merged into one and she has lost power traveling here too. It would take a long time for the Tardis to function again. 13th Doctor says what happened Goku? Goku says I was training in the afterlife trying to get Super Saiyan two and I was sucked through a wormhole. I woke up in a house and this nice family was treating my wounds. And last night a demon attack them and I failed to protect them and they died expect one was turned into a demon. I sense the boy changing and I do detect another ki. They're both moving down the mountain and I sense another ki coming towards them. Both Doctors say well we better go after them.
Both Doctors and Goku ran down the bank after them. 10th Doctor asks Goku how did you fail to protect them? Goku says well my Ki was messed up and still is a bit. We have caught up with them. The boy has already transformed. Tanjiro is above Nezuko and Nezuko is holding him back with a hatchet. Nezuko says fight it brother don't become a demon. Tanjiro starts crying. Nezuko thoughts (just like how I was at the start!). Nezuko moves avoiding an attack. The guy says why are you protecting it. Nezuko says he's my brother and I won't let you kill him. Giyu Tomioka! Giyu goes wait how do you know my name? Nezuko reply is I have seen and heard your name is some dreams I had. Tomioka says dreams?
What dreams? Nezuko says I think the dreams were pass memories of my pass life of when I was a demon and bigger brother was the demon slayer. Tomioka say memories of when you were a demon? That's right Nezuko says I remember my brother failed to cure me because he didn't get enough blood samples from other demons. I will make sure that I won't miss getting those blood samples.
Goku says Giyu was it Tanjiro didn't kill anybody. Giyu says you don't have any evidence. Goku says I thought against the demon he had smart clothes, a hat, curly hair and I think he said his name was Muzan Kibutsuji. Giyu accidentally says out loud even if I made it in time I would have also died against him. Goku asks why? Giyu says he's the most powerful demon, the first demon. How did you survive?
Goku says I survived because he ran out of time to kill me I think. Plus do you really think you stand a chance against me? Giyu says well with how easy I took this new demon off you yes! Goku says you mean this demon? Giyu was how did he I didn't see him move. 13th Doctor says I might be able to turn him back into a human I just need a sample of that boys blood along with samples of other demons blood. But I fear that those demons have to be closer to Muzan Kibutsuji meaning that they are closer to him in power. Goku says I only lost because my ki was messed up and it's sorted now. 10th Doctor says well Goku I know you can use instant transmission. So can you quickly go and get the blood samples. Goku says yes I go and do that now. Goku disappear and reappears with twelve blood samples. Thanks said both Doctors.
Too the Tardis. But Doctors I thought you said the Tardis is grounded. 10th Doctor says well it is but we can still use the science lab in the Tardis. Goku says I know that the Tardis is big and all but how big is it really? 13th Doctor says well I don't know. Giyu gets hold of Tanjiro again and stabs him in the shoulder. This causes Nezuko to throw stones with Giyu blocks. She charges at Giyu and he says you fool. But Nezuko moves to the side and lands a punch on Giyu stomach. Giyu managed to knock Nezuko out and dodge the hatchet. Tanjiro breaks free and gets into a defensive position protecting Nezuko. Giyu is shocked my this and knocks Tanjiro out. Giyu is thinking (just maybe these two are different.).
Well Giyu says to Nezuko go a see a man called who go a see a man called Sakonji Urokodaki who lives at the foot of Mount Sagiri and to keep Tanjiro out of the sun and tell him that Giyu Tomioka sent you.
13th Doctor says so how are you Goku? Goku says I am fine. I have mostly just have been training and eating since I am dead in my Universe. 10th Doctor says wait your dead. Goku says well Cell blow himself up and I saved earth by teleporting Cell to King Kai's planet. Cell survived and was killed by my son. So I just stayed dead and started training in the afterlife.
Nezuko had placed Tanjiro in a cave and wants to travel during the day so she goes and gets a basket with a thick sheet and some bamboo. Nezuko uses the bamboo to fix and reinforce the basket. Tanjiro fails to fit into the basket. Nezuko goes Tanjiro can't you make yourself smaller. You did make yourself bigger earlier. Tanjiro managed to turn into a little child and fitted into the basket. Well done Tanjiro. Nezuko thinks (I have to use this real name instead so he doesn't forget his name. I don't want him thinking he's called brother.). Goku appears and sees Tanjiro in the basket. Goku says well he's cute isn't he. Nezuko asks are you coming with us? Goku says yes well I have nothing else to do. And that both Doctors are working on a cure! Nezuko says really there actually doing that? Goku says yes I got blood samples of all 12 demon moons along with a sample of your brothers blood.
Goku says I did come across a tear in time between timelines and talked with an different version of myself that version of me managed to throw an blood sample of your demon blood Nezuko. I managed to catch it and give it to the Doctors who were angry that I talked with another version of myself. Also just before the tear closed I saw the other me pass some earrings to another different version of me and he said watch out for Turle's, and some other old enemies. I think I don't have to worry about fighting old enemies. I also heard the names Towa and Mira but I know that they're not the reason I am here.
Goku goes Nezuko do you want to see me do somethings. She says sure. Goku goes Kaio-ken this is a technique that multiples the users stats I can only go to times 20 and I want to teach you and your brother once he's turned back into a human how to do the Kaio-ken. But it does have a toll on the body and drains stamina and energy. Goku them goes do you want to see the other thing I can do? Yes Nezuko said. Goku says prepare yourself I might shake the planet. Goku powers up to Super Saiyan and shock the earth and says this is Super Saiyan. And this is further beyond and powers up to Super Saiyan two shaking the earth again. The 10th Doctor appears behind Goku and says why did you shake the earth twice? Goku says sorry about that I was just showing Nezuko and Tanjiro my power.
Nezuko says dam Goku you are powerful! Goku says well I do have enough power to destroy the whole solar system like 2.5 times. 10th Doctor says well I am sure that you have got the Demon Slayer Corps attention by doing that.
TBC
A/N:
Well I have decided to do this story which involves a weaker version of Goku that isn't nerfed. Nezuko having to become a Demon slayer with memories of herself being a demon from her pass life. Tanjiro is a demon. But the time tear is kind of a spoiler for the part of the ending of the Dragon Ball Super, Dragon Ball Heroes, Kimetsu No Yaiba Crossover, even know that's not where at one ends and Goku does did see potara earrings being passed to another version of the of Goku from Dragon Ball Super which has the consequences and also the Doctor involved and the Machines. This one Goku doesn't have any consequences because of different timelines. Also I am using the 10th and 13th Doctors in this three way crossover. Dragon Ball Heroes aren't involved this time.