In one of these stories, the Inhumans came about as an experiment on primitive humans in ages past by the aliens known as the Kree. The Kree were trying to find a way to boost their own genetic gene pool (since it was dying out) and to create a race of super strong soldiers to fight in the war against the Kree's enemy; The Skrulls.
Yes kids, we may actually have the first seeds of the Inhumans movie laid down for us in the The Avengers movie. But for you uber-fans you know what this really means? It means we may actually get to see Lockjaw and The Pet Avengers movie sometime in the future!
Lockjaw: Bulldog teleporter with a mustache.