I don't own Dragon Ball, Kimetsu No Yaiba and Doctor who. Dragon ball is owned by Akira Toriyama and Kimetsu No Yaiba is owned by Koyoharu Gotouge.

Last time Tanjiro was turned into a Demon but the Doctors are working on a cure. Goku used instant transmission and got blood samples of all 12 demon moons blood. He even got some of Demon Nezuko's blood from another version of himself from another timeline. Also Goku showed his power in Super Saiyan and Super Saiyan two which shook the earth twice.

Chapter 2: The Demon Slayer Corps investigation:

That the Demon Slayer Corps did you feel that it's was like the whole earth shook twice. The cause was in the area Giyu the Water Pillar just left Yesterday. He's not that far from the area and Shinobu is with him. I am also sending in Rengoku the fire pillar to the area too.

Back with Tanjiro, Nezuko, Goku and the Doctors:

Goku says when you were right doctor I sense three humans with a high power level coming this way and Giyu is one of them. I wonder who the other two are? 10th Doctor says well you got me and my future self in trouble since where not human and same goes for you. Nezuko goes wait I know that Goku is a Saiyan and he proved it. But what are you Doctor and don't lie. Fine I am a Timelord and the woman I am with is my one of my future self's. So when a Timelord dies we regenerate into a new body. But I am wondering how she exists along with the old man version of me before her. I met my next two incarnations by accident and I have now met the 3rd one above me. Even know I only remember this stuff because my timeline is out of sync and that the Tardis is down. But somehow the translation circuits are still working.

13th Doctor says thanks to the blood sample of Nezuko's demon blood from the other version of Goku I think I have successfully made a cure that might turn anyone back from a demon into a human well I might has try it on Tanjiro and hope that it works. Now I have to go to the cave Tanjiro is in. The Doctor arrives at the cave and enters the cave saying Tanjiro you can come out of the hole now I have the cure here. Tanjiro appears out of the hole because Nezuko decided to leave Tanjiro in the cave has she gets some food in the village. The Doctor injects Tanjiro with the cure and waits. 10th Doctor says how can you forget this meeting between us? 13th Doctor says well I petty sure I will forget after 2000 years. 10th Doctor 2000 years. God I live so long. Please answer this. Are you currently on a new life cycle? 13th Doctor says yes I am the second incarnation of this new life cycle.

Wait Tanjiro? Has the cure worked? Tanjiro removes the Bamboo from his mouth and says why am I in a cave oh yeah I was a demon. Wait did you two cure me? Yes both Doctors replied. Thanks I think I own you both. Even know I smell that both of you aren't human and you both have a similar scent. I remember that Goku is a Saiyan and that he Transformed I also own him. The 13th Doctor says well technically you just own me since me and the other Doctor are the same. Tanjiro asks what do you mean the same? One of you is a man and the other is a woman! 10th Doctor says well I am a Timelord and Timelords when near death regenerates into a new body and we're the same Timelord you see that's why you get a similar scent from both of us. Tanjiro says okay what ever you say.

Giyu, Shinobu and Rengoku arrive and say well we sensed a demon present but it disappeared! Rengoku says how could it just disappear? Well we sensed it coming from that cave other there. Wait I hear voices in the cave let's investigate. They see an full grown man and woman with a young boy. Straight away they could tell that the man and woman aren't humans. But both Doctors step out of the cave into the sunlight. Giyu, Shinobu and Rengoku now knows they're not demons and Tanjiro steps out into the sun too. Oh so there are no demons here but what caused the earthquakes? Goku appears and says sorry about that I was the one who shook the earth twice. All three of them go was he just flying? Goku says yes almost everyone from my Universe can fly. Goku them says I think I should try and fight Muzan Kibutsuji again since I can now use my power.

Nezuko comes back and sees Tanjiro standing outside of the cave in the sun. Tanjiro sees her and they hug. Giyu goes so you have done it you have turned him back from a demon into a human again. Shinobu says wait he was a demon explain Tomioka San. Well Yesterday I came across him and he just turned into a Demon but I didn't intend that he will be turned back so fast. The 13th Doctor says well that is because of me and my pass self here and Son Goku. Goku got blood samples from all 12 demon moons and a blood sample from himself from another timeline which helped made the cure a success. 10th Doctor says it's true. Goku says yeah.

Tanjiro and Nezuko have already left to go towards mountain Mount Sagiri. They stop and ask a woman for directions. Goku appears behind them and says I am coming with both of you. Goku says to the woman don't worry we will be fine. I can't sense Urokodaki's ki for so reason so I guess we're walking. They walk along and come across a temple.

The Doctors have finished explaining stuff to Giyu, Shinobu and Rengoku. Who now understand there situation. The Doctor show all three of them the Tardis. All three of them go how is this possible it's bigger on the inside. 10th Doctor says future me I don't like what you did with the exterior. 13th Doctor says you never like any of the future desktops do you

At the Temple Tanjiro opens the door and Tanjiro and Nezuko are shocked to see a demon eating people. The demon goes who are you trespassing on my turf. Are all three of you Human I am picking up a weird vide. The demon launches at Nezuko but Goku blocks the demon and punches the demon away. The demon says I know there was something off about you but your not a human or demon. What are you? Goku says why would I answer someone who's soon going to be dead. What Goku punched a hole through the demon's chest. Goku backs off and goes kamehameha blasting the demon and destroyed all of the demon's cells. Goku says I might have other done it but at least it can't regenerate since there's no cells remaining.

A man with a mask comes behind the three and says how did you kill the demon? Goku says I blasted it they can't regenerate if no cells remain. Tanjiro says I am Tanjiro Kamado. Nezuko says I am Nezuko Kamado, Goku says I am Son Goku. Well I am Urokodaki. I heard that Tanjiro was a demon and how is he human? Goku says well me and my friend the Doctor cured him. Urokodaki says is that so. Follow me. Tanjiro and Nezuko follow him but Goku doesn't. Sorry I am going back to the Doctors I catch up eventually.

Tanjiro and Nezuko arrive at Urokodaki's house and are shocked when he says the test starts now.

The letter. I am writing to you about training a girl her family was slaughtered my a demon and the only survives are her brother which as been turned and I believe he won't harm humans and the other survivor was just lucky. The girl said she wants to become a Demon slayer and she can see colours like in a fog and the other guy says he a detect life energy. I know this is a selfish request. Your sincerely Giyu Tomioka.

Goku appears with the Doctors my using instant transmission. Goku also moved the Tardis too. Urokodaki is surprised that here arrival. He says Tanjiro and Nezuko have to make it back before sun rise. Tanjiro and Nezuko arrived badly hurt at the door. Urokodaki goes Tanjiro and Nezuko I accept you both has my students. Now Goku it's your turn Goku says I think I pass on that. Goku I won't accept you. Find I do it. So I just have to run down the mountain right avoiding traps. That's right.

TBC

Author notes:

I am not making these chapters that big because the other story has big chapters. I find this way easier so I don't keep getting headaches. The other Fanfiction I am planning is a 5 way Crossover and I haven't started that one yet. Yes Tanjiro is now human again. So human Tanjiro and Nezuko now. Goku hasn't got around to getting Super Saiyan three yet but he doesn't need to use much of his base form power at all. Both Tardises are still merged. Now I am taking a break like I said in the other fanfiction I am still waiting for a brain scan and some blood tests.