This was going to get two stars but the very ending of the film is pretty good. The middle, oh my. It consists mostly of a useless main character and his buddy running around. If I genuinely cared for any of the characters in the first place I might go back and figure out exactly what was meant to be going on with them, despite the lack of character development related to communicating their friendship to the audience, which would get us to feel their bond in a deep down way and engage better with them.

The main character is difficult to root for because he is sniveling much of the time and not able to work anything out... until the very end, which as stated, is excellent.

The young boy in this was the most believable performer. The adults... hmm. Better direction and casting are needed here.

The creators could have done a bit of chemistry research. In the film we have 'artificial' oxygen which is somehow toxic compared to 'regular' oxygen. Guys, Oxygen is Oxygen however the heck it is made. Mix it with the right ratio of gasses, you have air. Did the people in 2067 forget there are three forms of oxygen or the like? If toxic, it's no big feat with the tech we have right now to work out why. Then extract the toxin, pathogen or non-diatomic molecules and presto, the air will be good for all. Why was this not done, or tried? Also, it's air we breathe, not just oxygen. Breathing Oxygen only will kill you.

Never ever came across a sci-fi with people shedding tears almost in every other scene. A bit over the top 'emotional weight' quotient I'd say! You'll know when you see it.

A bit interesting in parts. Visuals of apocalyptic+future earth are definitely super good. A one time watch on a lazy afternoon

Artificial oxygen. That was my first clue that this was going to be nonsense. There's no such thing. There is only oxygen. It's an element, not a product. However you obtain it. However you extract it, it is still just oxygen. So the conceit of people being allergic to "artificial oxygen" is just utter nonsense.

Then there's the crying...

There isn't one character in this movie that doesn't blub their way through at least one painful dialogue exchange. The main character is practically in a permanent state of distress that is just exhausting to watch. It's just too much.

Then there's the acting, or rather, lack of it. The two main characters (when not crying like babies) are decent enough, but the rest are B-movie category at best, and amateur dramatics at worst. The evil lady leader is particularly good at scenery chewing. And yes, she tears up at points.

Then there is the usual time-travel nonsense that is badly thought out and realised, with things happening before they could possibly have occurred and paradoxes galore.

But the crying is the worst part. It just never ends and overshadows everything else to such an extent as to make the movie unwatchable and tedious.

Realistically, this is an episode of the Outer Limits, or Twilight Zone, padded out with unnecessary emotion and lack of thought. A trial of the senses to sit through.

And the ending...

Having altered time, our hero travels a few hundred yards from the ruins of the time machine building to find a shining city where ruins once stood. So these people, having been saved by his actions, couldn't even be bothered to restore the site of their redemption and restore it to glory? Couldn't be bothered to turn it into a monument of sorts? They just left it as a ruin? Come on! That's pathetic writing!

SUMMARY: Crying hero. Crying villains. Crying extras. Lots of crying. Overly melodramatic interactions. Nonsense time travel dynamics. Nonsensical basic science. Some truly awful acting. On the same level as After Earth but did I mention there was more crying? Not recommended at all.