When a Cyborg nicknamed Chas (Cybernetic Humanoid Assault System) is assigned to the Roughnecks, he is befriended by Higgins, who views the robot as a kindred outsider, but Rico is mistrustful.

While returning from a mission, the Roughnecks are attacked and captured by a contingent of the humanoid Skinnies. Tensions mount in their prison cell, and while Carl and Brutto are being interrogated, the rest of the squad works on an escape plan.

After clearing a mountain pass of a row of Blaster Bugs, the Roughnecks are able to capture Colonel T'Phai, the leader of the Skinnies. But what Carl finds out in interrogating him is a huge surprise.