Board Thread:General Discussion/@comment-24720945-20140514053744/@comment-27213286-20160405215059

The answer to the questions would all depend on what kind of time travel you find most plausible. There are many theories about what would happen if someone time traveled.

1. Nothing you do in the past has any effect on your future because during your timeline a future you was always there doing what you are doing now.

2. If you change something in the past it can change the future and you could accidently prevent yourself from existing causing you to fade from existance. Your memory when you get back to your normal time will only remember the timeline you lived in before you time traveled and nothing that you did only in the knew timeline.

3. Same as theory 2 but memories from the new timeline will be added to the memories you had from the old timeline.

4. Everything you change in the past changes the future and if you change it too much you can become an anomaly in time where you do not exist in your time anymore, if you change enough where future you never travels to the past then their will be another version of you in the future that lived a different life and the you that time traveled will no longer have a place in time. In this theory if you kill your past self or past relatives before you are born you do not vanish but nobody in your timeline will know who you are because you never existed in the timeline they are from so they would be seeing you for the first time,

5. The time line will fix itself, this is also known as the "time wraith" or "time ghost" theory. If the timeline senses that you are about to do something that threatens the current time line in a way that cannot be changed back a spirit will step in and revent you from doing so. The spirit will prevent you from altering the timeline too much or causing any type of time paradox even if this means killing you so that you won't be able to change anything too drastic.

To answer your scenarios you will have to pick theory about time travel and apply it to your scenarios. Just know that it is possible for Once to create its own theory of how time travel works, these are just five of the theories I can remeber from other shows and movies I have seen that use time travel.