There are basically three kinds of time travel stories in terms of they handle paradoxes:
- Stories that obey the Novikov self-consistency principle, like the TV show LOST and the movie Interstellar, where you can’t change the past, just bring about past events.
- Stories like the TV show Dragon Ball Z, where time travel involves going into a parallel Universe
- Stories like the Back to the Future that don’t make logical sense
But the Indian movie 24 seems to be in a fourth category. Here’s how time travel works in 24:
- There is a watch that allows its wearer to travel through time.
- There can only be one copy of the watch at any given time.
- You can only input a date and time into the watch if you are alive at that date and time and the watch exists at that date and time.
- Once you input an (allowed) date and time, your consciousness will be sent back into the version of your body at the date and time indicated.
- Once your consciousness is sent to the destination date and time, the watch teleports from wherever it was at that destination date and time and appears around your wrist.
- From then on, a new course of events for your life plays out.
My question is, do these rules make logical sense, or do they allow for the possibility of time travel paradoxes of some kind?
If they do allow paradoxes, is there anything paradoxical that’s featured in the movie itself?