The Brave and the Bold #32

While exploring a new cavern, Cave Carson and crew watch as a humanoid alien falls and dies. Using materials left by the alien, the threesome use the Mighty Mole to descend and ultimately come upon an alien city lit by a sphere in the sky. The aliens tell Cave that a faction, led by Xanon, want to work their way to the surface to flee a deadly gas they’ve been exposed to, not caring that it could mean the death of all humanity. Bulldozer is captured.