Hi! This is my first ever crossover fan fiction! I've taken two of my favourite franchises ever: Sonic the Hedgehog (Video Game Series) and Doctor Who (Television Series). This is set after the events of Sonic Lost World but between the events of The Waters of Mars and The End of Time when the Doctor is delaying his visit to the Ood, I haven't seen The Day of The Doctor yet, so I'm sorry if any part of this doesn't make sense but just imagine that this is before the 10th (David Tennant) Doctor goes through The Day of The Doctor, or that this is a parallel universe's version of The Doctor but this isn't a part of the Doctor Who or Sonic the Hedgehog's story canon.

And now, a disclaimer:

This is a work of fan-fiction using characters, locations, entities, items and events from the Sonic the Hedgehog and Doctor Who franchises. Sonic the Hedgehog is owned and trademarked by SEGA Japan and all other respective countries, and Doctor Who is owned and trademarked by the BBC. I do not claim ownership of any characters, locations, entities, items or events in the Sonic the Hedgehog or Doctor Who franchises. The story has been created by me and is not purported or believed to be a part of SEGA's or the BBC's story canon. The story is for entertainment purposes only. Any resemblance to any character, object, event, location or entity that is owned by anyone other than SEGA or the BBC is purely coincidental. I am not profiting financially from the creation of and publication of this story. I am grateful to SEGA for their amazing video games about Sonic the Hedgehog and I am grateful to the BBC for their spectacular television series about Doctor Who, without either of them my story would not exist.

Sonic's POV

09/06/2026

10:48

Central Station Square

I am Sonic the Hedgehog, fastest thing alive and one of the various heroes of the Earth, but you probably knew that already. I was enjoying a nice relaxing jog at roughly 40mph, I would run faster but I was in a heavily populated area with a quite a few giant buildings so I can't risk hitting someone at 60mph because that's probably lethal. I am only allowed to run at the speed limit when it isn't a dire emergency because with my speed comes lightning-fast reaction timing and my sneakers allow me to brake quickly, but if I can't see someone because my vision is impaired from the speed then I will most likely crash into them. But hey! That's not really important right now; anyway I was enjoying my run when I got a call from my friend Tails on the amplified Bluetooth device he built for me for Christmas two years ago. He said he needed me at his workshop as soon as possible, and since I wasn't allowed to run there since I was unaware if it was an emergency or not, I took the train to his workshop in the mystic ruins.

Why he would need me at his workshop was beyond me, he didn't sound urgent like he was under attack, and I didn't particularly compare to him intellectually. I'm not below average intelligence or anything, in fact I have a higher than average human IQ according to Tails, it's just that Tails has an IQ of 400! I'm not even sure if that's measurable but Tails found out his IQ was 400! Why would he need me to help with anything? I would've thought he just wanted to hang out with me and our friends but he wanted me at the workshop as soon as possible, and that's not a sign that you want to hang out with someone as far as I'm aware. These questions plagued my mind until I got off the train at the Mystic Ruins.

I met with Tails in his advanced laboratory below the workshop and was surprised to see that I wasn't the only one he invited. Tails was waiting with my other friend: Knuckles, and my friendly rival: Shadow… Well, I when I say friendly I mean he doesn't try to kill me… Anymore. "Hi Sonic! You took longer than we thought you would." Said Tails. "Losing your touch Faker?" Questioned Shadow. "Hey guys. I'm sorry I'm late, I had to take the train because you know? Major city. Anyway Tails, what's going on?" I asked Tails. I was kind of disappointed about the restrictions enforced in casual circumstances unless I had a Chaos Emerald or it was an emergency, I could chaos control with an emerald if I had one, with great difficulty but I could still do it, but I had given any chaos emerald I found to Tails ever since Eggman escaped the void and attempted to enslave the Earth. "Well, you see I have been working on a device that would allow individuals to travel from one point in our universe's timeline to another in an invisible, inaudible and intangible state as to avoid any time paradoxes. But it's powered by the Chaos Emeralds so I need you and Shadow to use your natural connections to chaos energy to power the emeralds and I need knuckles to use the master emerald as an emergency stop in case the chaos energy exceeds safe levels and causes something like the device to impair or collapse in on itself or something like that." Explained Tails. I understood what I and Shadow had to do, when we store chaos emeralds we have to make sure that they aren't being powered so we don't do any unwanted damage to our environments, so Shadow and I were used to doing things like that.

We went over safety precautions and what to do in certain events, Tails was prepared for all circumstances as this has probably been a dream of his for a long time, and he didn't want that dream to end in our universe being ripped apart by something as large as a time paradox or something as small as a loose bolt. And after roughly half an hour, we were ready.

Shadow and I closed our eyes and concentrated, using our chaos-infused minds and bodies to access the power of the chaos emeralds and raise it. Knuckles was in a calm yet alert state, he couldn't afford to be rushed and risk accidentally raising the emeralds power if they exceeded the machine's limits, but he couldn't risk reacting too late and not being able to do anything at all in such a circumstance. Tails was running the software on the device to activate it's time travel capabilities without accidentally blowing a hole in the space-time time continuum and making sure that all settings were maintained and stable.

I could feel a large output of chaos energy in the room and I knew that the device was working; we had planned to send a toy with a video camera attached to record if it worked safely for at least non-biological life. I was excited, as was everyone; we had just pushed scientific technology into a new era, or at least we thought we had until we heard the device say something in an electronic voice that we had all hoped it didn't say or anything along the lines of it. 'Warning! Maximum chaos output unstable!'

After that it I was blinded and I could hear Knuckles scream but it sounded to me like it was in the distance. He screamed, "I can't stop it! It's beyond control!"

After that I did the only thing that I was capable of doing at that point, I screamed.

Thank you for reading the first chapter of my first ever crossover! I hope you enjoyed this chapter and all future chapters!