This story is based upon the Tenth Doctor, The Flash, Doc Brown and Marty
THE MEETING OF TIME TRAVELERS part 1
Wind filled the area around Hill Valley city's great town hall, apparently it had been struck with lightning when it stopped, that was also the time that "it happened", the disturbance in the T.A.R.D.I.S's matrix core had felt it, the Doctor had felt it, and so had the other living time travelers, if there were any others...
- November 12th 1955, Hill Valley -
The T.A.R.D.I.S materialized into view onto the porch of Hill Valley's Town Hall at around the time of 2:00 pm, "The disturbance appeared to be greatest at around 10 pm at night, but the scanners say that it started now." He looked around, nothing, the area which surrounded him built, but empty. "Under construction, indeed interesting." He said as he read a sign hanging from a wire. Nothing was bothering him until he saw the two strangers standing on the side of the road.
"Two people, well at least it's not lonely. But still there's something oddly suspicious about them." He said to no one in particular, he was the last time lord now, he was alone. "Wait a minute..." He thought to himself as he observed the strangers. He noticed. The two strangers were not two different people, they were the same, one dressed as a scientist and the other as a tourist, but together, the same person from different timelines. "Impossible" he thought as he ran towards them, but stopped almost immediately as he saw the tourist looking one walk away.
The Doctor walked towards the scientist, who was working on some sort of contraption to do with the town hall. "Hello there, what's your name?" The Doctor asked as he walked up to the scientist. "Ahh, hello there, um, if you wouldn't mind could you pass me that screwdriver over there. Oh and my names Doc Brown." He said as he saw the Doctor walking up towards his toolbox. "Nice to meet you Doc Brown, what are you building?" The Doctor asked as he rummaged through the tool box. "This, oh this is just a weather experiment" Doc Brown said as he continued to work.
"Are you sure it's not an experiment that messes up the current timeline to divide it into different futures?" The Doctor asked. They both stopped working. "How did you know?" Doc Brown asked "You're not part of some time traveling police officers or assassins that come here to kill me for sending a friend back to the future are you?" He continued. "Don't worry, I'm not, in fact I'm here to help, you don't seem like the type to come here and destroy Earth or Time for that matter. So I'll help until I find a problem with your engineering." The Doctor replied as he took out his Sonic Screwdriver and pointed it at a parchment In between two wires and then let it do its work. "Come with me Doc Brown let's have a chat about ourselves." He said as he dragged Doc Brown into his T.A.R.D.I.S.
- Meanwhile -
A portal opened in front of Hill Valleys town hall as the T.A.R.D.I.S's doors closed shut. The portal shimmered and shun a great blue color as a person, no a creature, zoomed out. It ran around the area once or twice before stopping at the experiments power box at the middle of the square outline. It opened the box and placed a grayish tube into the power boxes central mainframe. After that the creature ran back to its portal. "See you soon Flash, have a nice trip." It said before running back into the portal as it collapsed upon itself.