Terminator Genisys: 18 Stupidest Moments In 2015's Dumbest Movie

The biggest general problem with Genisys is that a large proportion of its science and internal logic is absolute garbage, whether James Cameron was involved in advising or not (that's not quite as impressive a claim as it once was).

But it's sort of okay when the action is racing along because you don't really notice that you're teetering on the knife edge of some seriously ropey physics. And indeed biology. (The less said about the chemistry on show the better).

It would only be a problem if the film attempted to spend about 30% of its dialogue explaining how alternate timelines work using pseudo-scientific mumbo-jumbo. Which, of course, it does.

And not only that, it doesn't even bother to pretend it's listening to its own explaining. In having Arnie's T-800 be the voice of wisdom, and then having Kyle Reese literally say that the way he speaks about intelligent things makes his brain hurt says everything you need to know about how important the writers thought explanations ought to be.