A boy and his maze (Filled with monsters and people). Richard

  Only Thomas and Chuck remained. The rest of the team had escaped out of them maze. After fending off a few more Grievers, Thomas and Chuck ran towards the exit. They were almost to the exit, but a shadowy figure blocked the way.
  "Who is that?" said Thomas. Suddenly, lightning hit the ground where the shadowy figure's cape lay. The lightning revealed the figure to be no other than Gally! Gally's cape was set on fire.
  "Darn it, this happens every time!" yelled Gally. He took off his cape and threw it away.
  "Anyways," Gally said. "I can't let you guys leave this maze. Really, I can't. I would get in a lot of trouble if I did. So, I'm going to have to kill you guys. Right here, right now." Gally reached behind his back. He grabbed a weapon and pulled it out in front of him. It was several nuclear warheads, rigged up into an oversize rocket launcher.
  "This may be a bit 'overkill', but I never want to have to see your ugly faces ever again." said Gally. He aimed the nuclear warheads at Thomas and Chuck. He pulled the trigger, and a mix of multiple Hydrogen and Atomic bombs headed in Thomas and Chuck's direction. A griever decided to walk in front of Thomas and Chuck. The nukes hit the Griever and impaled him, getting Griever slime all over Thomas and Chuck. The bombs exploded on Thomas and Chuck. A massive explosion erupted around them and swallowed up Thomas, Chuck, and Gally.
  All that remained was a giant crater. A giant crater with Thomas and Chuck inside.
  "I guess it turns out that Griever slime is explosion and radiation resistant!" said Chuck. All that remained of Gally was a pile of radioactive slop. Thomas and Chuck high-fived each other. They ran towards the exit and jumped through the portal. Little did they know that the radiation caused severe changes to the portal's location. Thomas and Chuck fell into a pit of frequently changing walls with the occasional elephant or refrigerator flying past them. They fell for what seemed like hours. Finally, they saw an exit. Before they knew it, they were standing on the ground of Glade. The grass was as green as the day Thomas arrived in Glade.
  "WHO IS THAT?!" Yelled someone from a distance. Thomas and Chuck stood there, still covered in goo. Thomas was approached by Thomas.
  "What? It's me? Who covered me in slime?" said Thomas. Chuck came because of the commotion and found himself covered in slime, too.
  "Why is there another of me?" said Chuck. "This is obviously a work of the creators to deceive us! We must kill these clones!!" So, the slime covered Thomas and Chuck fought the other Thomas and Chuck. They fought for at least an hour. The slime-covered Thomas and Chuck managed to defeat the regular Thomas and Chuck! With one final move, slime-covered Thomas killed the regular pair. Thomas and Chuck were in relief. Then Chuck got an idea.
  "Hey, what if those were our past selves. If we killed them, wouldn't we cease to exist because they died?" said Chuck. Then all the sudden, Thomas and Chuck disappeared. The Glade society, left without a hero, was forced to starve to death and get eaten by grievers.