Sam and Dean were on the on for demons. When they were hunting demons they tried to kill the first demon they saw. Then the X-Men came and tried to stop Sam and Dean. Cyclops said to Dean "What are you doing? That is a mutant." Dean said back to Cyclops "No that is a demon." Cyclops and Dean started arguing who was right. Wolverine came along and stopped the argument. "Explain yourself bub." Wolverine said to Dean. "We are the Winchesters and we're here to hunt demons. And that was a demon you guys just let get away." "No that is a mutant."
What they didn't realize is that the person was half demon and half mutant. The Winchesters and the X-Men went their separate ways. Sam and Dean notice that the demon was on the run again and they went after him. They didn't know that the demon could duplicate and that he was also a mutant. The X-Men came after the mutant too. Dean told Cyclops "don't he's half demon and half mutant." Both Cyclops and Dean went after the demon/mutant together.
Sam told the X-Men "We half to work together to stop the demon/mutant." The X-men agreed to work with Sam and Dean to stop the demon/mutant. They got ready to stop the demon/mutant. After they stopped him the demon/mutant said there were more demon mutants. As more demon mutants came the X-Men were taken one by one and it was up to Sam and Dean to save them.
Sam and Dean tried to stop every demon mutant they could to save the X-Men. What they didn't know was that there was a king and queen demon mutants. They killed all the demon mutants and went to the layer of the king and queen demon mutants.
They didn't know they were caught. When they woke up they saw the X-Men at the lair of the king and queen demon mutants. The king demon mutant said "You can't stop us. We will rule the world with demon mutants." Dean said "You won't get away. We will stop you."
The queen demon mutant told him "You won't be able to stop us once every human is a demon mutant."
To be continued