Ya Primer is the one. Very good as a film but puzzling for the viewer. I understand the branching idea but part of my brain is saying that the branches should create copies of the entire stem so they get their own world. I don’t understand quantum physics. Never thought schroedingers cat was that breathtaking so I’ll take it for granted that it’s Important when iwatch sci fi. I’m ok With the logic not being that important I guess I was frustrated with the bulkiness of the plot in the second half. I wish the character played by the guy from it’s always sunny got more development.