One of the hidden gems in 2013 was "Snowpiercer". It shares many similarities with the world of Half-Life 2.
The story sets in the dystopian future, when mankind became nearly extinct after a global catastrophe. A megalomaniac holds a tight grip on the fate of humanity, and a decrepit leader (Eli Vance) inspires a resistance to overthrow the oppressor.
It's a brutal film that is saturated with graphic violence, but at the same time very stylistic. Any sci-fi fan would appreciate it.
For all who have it, It's on Netflix!