Predestination movie, how did the main actor end up in closed time loop?

Well, as I haven't seen the movie, I'm not sure how to help you, but here I got another example of what I think you're referring to.

In the movie 'Somewhere in time' (Christopher Reeve/Jane Seymour), the older version of her gives him a pocket watch in the present. When he goes back to the past,he gives the same watch to her young version, which then she will give him back when she gets old. So it's a time loop, right? But my question is, what is the origin if that pocket watch? If the 'old' woman gives it to him in the present and he takes it back to the past and gives it to her 'young' version, then who bought the watch in a first place? Where does it come from? Was it hers or his? there's no answer! And it drives me crazy!

I guess that when messing with time, time sometimes messes back with you, creating these unexplainable things. If not, then no idea.

Hope it helps! ;)

no there's need for any "real parents." the possibility of the whole closed loop follows logically once you accept the time travel itself as a possibility. some people would probably argue against time travel being possible in the first place because of stuff like that. It makes a nice story though. This movie is based on a classic robert heinein story by the way, called "all you zombies," published in 1958 if you want to know.

I think this movie is about the best adaptation of a heinlein story I've ever seen on a screen. They did add some stuff to it, but they did a good job of that.

Loop Movie Time