It's no definitive masterpiece but it's damn close.

Good story, Not enough for a whole film

A film with more than the usual spoiler issues. Talking about it in any detail feels akin to handing you a gift-wrapped present and saying, "I hope you like it -- It's a thriller about a diabolical secret experiment."

All of these films share one commonality, that being a kind of emotional center that humanizes a cast of monsters.