The Pro Heroes were checking an abandoned city out that had been under water for a long time, they walked past a creepy, old abandoned lab when suddenly they heard a scream coming from inside the lab but the screams weren't normal, it sounded like 2 people at the same time...

Endeavour: "What was that?" Eraserhead (Aizawa): "No idea" Looks at the lab Hawks: "Should we check it out, there might be someone in there" All Might: "I think that's a good idea Hawks, however we should be aware of what can be in there. They might be dangerous or inhuman. I mean that lab is know for their inhuman experiments" Midnight: "Hey guys don't you find it weird that it sounded like two people at the same time? It's rare for two people to scream or talk at the exact same time" Ms. Joke: "Midnight's right, whatever's in there isn't gonna be normal" Eraserhead (Aizawa): "We shouldn't think of that, maybe it's just an echo from inside, if it's abandoned then there probably aren't many things inside anymore which can cause an echo. But overall I'd say we investigate, they might be a child for all we know" All pro heroes agreed with Eraserhead (Aizawa) and went to investigate, many of them seemed uneasy by the lab though. There was blood everywhere, on the walls, on the floor, on the ceiling. The doors had claw marks all over them, some doors had a text written on it with blood, like: "It's all their fault" etc. One door however didn't have any claw marks or blood on it. It had a sign on it that said: "Experiment 591" and it had a code panel next to it. The pro heroes decided to try and figure the code out, their first try was correct. The scientists weren't very smart as the code was just '1234'. The pro heroes entered and what they saw shocked them terribly. Inside was a human, with tons of wounds that weren't treated and were probably already infected... it was you... You should have lost consciousness from blood loss already but you were very awake. You were tied to the wall by chains and you were trying to get out of them.