An Olympian makes a deal with our favorite hero to travel dimensions and be de-aged to save a world that is different then his own.

During the Second Giant War, the battle with Gaea, Percy lost his friends, the seven, including his wise girl. The demigods had won, Camp Half-Blood, Camp Jupiter, and the Olympians were safe now. Yet, it didn't feel like victory at all to Percy. Percy decided to walk out of the camp barrier, to escape from the memories, from the pain. He didn't care where, as long as he could get far away. He wanted it to be done. The guilt, the sadness, he wanted it to be over, he didn't want to feel any of that. Unbeknownst to him, he ended up on the streets of Gotham city. Where he encountered the hero dressed in black with a bat symbol on his chest. He was saved by the Dark Knight himself, the hero of Gotham. What could possibly go wrong? Or... right? Disclaimer: I don't own DC or Percy Jackson, only the plot. The characters belong to their respective owners.