Very little is known about the Alien invaders. What is known is that they came from behind the sun in a swarm of evil looking ships, bringing new devastating technologies to a planet only just beginning to reach for the planets in their own solar system.
Scientists have theorized that they come from a sister planet of Earth that is in an orbit on the opposite side of the Sun (for their ships don’t appear to be able to do any form of light speed travel), and that their planet is slowly dying, so now they want to use our planet.
They won’t get it without a fight!
Here's a size comparison pic of one of our figures against other manufacturers: