Time Travel, True or False Options

It's depicted in several movies. Terminator uses technology, The Butterfly effect uses a phychological element, and Superman circles the earth several times to turn back a few minutes to save Lois from an earthquake. Is time travel possible? Magic, technology, speed. What are your thoughts?

Our soul or consciousness or whatever you want to call it has the ability of existence beyond our world hence i believe that since our very essence isn't bound by the time and space parameters is able to travel back in time. I don't believe that you transfer your psysical body though since that IS bound by time parameters. so the famous paradox -what if i go back and kill my grandfather- i don't believe that is possible since you won't be able to go back beyong your own timeline since you won't have your vessel to inhabit.
I believe that we are total masters of our fate and that if we want we can change it as we see fit but i don't believe that you can go back in past to alter someone else's life as that would be against free will -even if it's something like -warn your best friend about a fatal car accident.
So if you want to alter your past perhaps if you could send your consciousness back to 'possess' your body and warn your past self of certain things. Of course that would change dramatically the time frame we now perceive as present and you could also risk your mental health (big time).
So, i had an idea for something a little bit more safe ... what if you evoke your future self and get info for the future ? (IMG:style_emoticons/default/Lighten.gif)