Meet Sigma: A Drell mercenary, raised in a lab and bred to be a trained killer. He lives on Omega, taking odd jobs for the highest bidder, usually taking down villainous criminals. This is his first story, where he is hired to kill members of the Eclipse Mercenary syndicate.

Our hero, ex-NCR courier of the Mojave Blaise, along with his friend Boone, go to New Vegas. What awaits them there?