Retcon 2025 is a hypothetical event in which the entire timeline of human history is retroactively altered, with no evidence of the change remaining. The term is a portmanteau of “retroactive continuity” and “2025,” the year in which the event is predicted to occur.
The idea of Retcon 2025 is based on the concept of the multiverse, in which there are an infinite number of parallel universes, each with its own unique history. According to this theory, Retcon 2025 will be a point in time at which the timelines of all of these universes will converge, resulting in a single, unified history.