Hellboy is a demon who came to earth as an infant after some Nazi's opened up a portal to another dimension (yeah, I know it's out there). The Nazi's and the evil Russian, Grigori Rasputin, were trying to unleash some monstrous entities on the Allies in order to defeat them. But the Allies put a whooping on them, but not before some of the Nazi's escaped and Rasputin got absorbed into another dimension.
Flash forward 60 years and Hellboy is working for the secret government agency, the Bureau of Paranormal Research and Defense, along with psychic, amphibious humanoid, Abe, and Liz, who is having trouble controlling her pyrokinetic abilities. The Nazis come back with Rasputin and their multiplying, hellhoud, Sammael. It's now up to Hellboy and his crew, to save the world or something.
Hellboy is one of my favorite comic book movies that has come out and is probably the best one currently on Netflix. He doesn't have daddy issues like Thor, he doesn't have biopolar disorder like the Hulk, he's not a skinny white-guy like Ironman and he wouldn't lead us into Syria like Captain America probably would. It's full of action with a decent dose of comedy and is worth a watch.