Alex Peterson, aka Scar, doesn't know many details about his past. He doesn't know why two aliens took his mother away, he doesn't know why two other aliens killed his father, and he doesn't know how he got the scar on his face-the one that occasionally turns him...

Alex Peterson, aka Scar, doesn't know many details about his past. He doesn't know why two aliens took his mother away, he doesn't know why two other aliens killed his father, and he doesn't know how he got the scar on his face-the one that occasionally turns him into a murderous monster.

He lives on the streets of Neetro City with his partner Christine Summers, and together, they steal the things they need to survive. But life as usual is disrupted when Alex is taken by a man in a suit and brought to the Assassination Police Department, who gives him an ultimatum: Join them and help to eliminate the dangerous people who terrorize Neetro City, or die.

But what they don't know is that sometimes Alex is one of those "dangerous people". How long will he be able to keep that a secret?