We've got an exclusive trailer for Syfy's new alien Western, Defiance. Set in a post-apocalyptic Earth that's trying to rebuild after a long and disastrous alien war, the show centers around the population of a town called Defiance, formerly Saint Louis. It's like Firefly — but with a crap load of more aliens, and all stuck in one place. Check out this new trailer for the television series, which will sync up with a giant MMO game, so that your actions in the game affect the show.

Defiance will premiere on April 15th, 2013.