Tron!AU, I’m not that familar with Tron’s world, but it’s like:
“User” Dick Grayson was accidently teleported into the virtual reality world Grid, where he met the long-dead Jason Todd recreated as an AI program foe. Eventually they became friends and with Jason’s help, Dick made it to the I/O Portal and went back to the real world. Only then he found out the fact that in real world Dick Grayson was actually already dead and his memory of being teleported as a “User” into Grid was made up and programmed. It was him who was the AI program created in the Grid, while Jason was the “User” who went into the Grid seeking to bring Dick to life, but was brainwashed by Joker to think himself as a program.
Sorry for my messed up wording… Hope you like this AU!