A time-travel tourist from the past becomes stranded in future New York City, forming an alliance with a rebel group to stop time-travel purists from altering the past, only to discover that they were from the future all along and must use their knowledge to shape a better future.
Protagonist: A time-travel tourist from the past who becomes stranded in future New York City; Antagonist: A group of time-travel purists who believe that altering the past will have catastrophic consequences for the future.
The protagonist forms an unlikely alliance with a rebel group of time-travelers in future New York City, joining forces to confront the time-travel purists and prevent them from altering the past, which could have catastrophic consequences for the future.
The protagonist and the rebel group successfully stop the time-travel purists from altering the past. They realize that the future is not set in stone and that they have the power to shape it for the better. The protagonist finds a way to return to their own time, but chooses to stay in the future, using their knowledge and experience to help build a better world.
Twist: The protagonist discovers that they were actually from the future all along, and their presence in the past was meant to ensure that the future they came from would never come to pass. They decide to stay in the past and use their knowledge to create a new, better future.