Caste (Cowboys & Aliens)

The Caste, also known to humanity as Demons, are a spacefaring reptilian species which invaded Earth in the continent of North America in the year 1873. Prior to that, they have also conquered and enslaved numerous other species, including a race of shapeshifters.

Biology
The Caste are reptilian creatures, considerably taller than Humans and also far more muscular, which probably owns to the fact that their homeworld has a naturally higher gravity. They have scaly skin, sharp teeth and horns on their heads, as well as a lizard-like tail. At least some members are known to have two extra pairs of arms. Their blood is greenish-blue in color.

They can operate in Earth's atmosphere without special equipment and without discomfort, although they find the gravity slightly lower than what they're used to.

Culture and society
The Caste are a xenophobic civilization which believe themselves to be superior to other species. They have conquered numerous worlds and employ members of other races as servants.

When they land on a new world, they've been observed to kill natives to study them and dissect them.

Their technology includes saucer-shaped spacecraft, anti-gravity metals and energy weapons.

Appearances

 * Cowboys & Aliens, graphic novel (2006)
 * Cowboys & Aliens, movie (2011)