The Roughnecks are one of several squads sent beneath the surface of the planet to locate the source of the bug army, dubbed "Bug City," and call in an airstrike. As the Roughnecks travel deep into bug tunnels, Dizzy suffers extreme claustrophobia, putting the entire squad at risk during numerous bug attacks. Eventually, Carl places a hypnotic suggestion in Dizzy's subconscious, curing her of her phobia.
The Roughnecks finally emerge back on the surface of Pluto, inside a massive asteroid crater filled with bug eggs that have already hatched. Then, the Roughnecks witness the arrival of a Transport Bug, which lays more eggs and drops off hundreds of adult Bugs -- leading to the revelation that the Bugs are not native to Pluto, and the S.I.C.O.N. forces are no longer facing a simple infestation, but a full-fledged war.