Brave and the Bold, The #32

THE CITY 100 MILES DOWN Deep, deep below the earth's surface, Cave Carson and the gang find an underworld city. They learn that it's people are dying because they breathed in noxious gas that burst through the ground below them. Most of them have already chosen to die with quiet dignity, but when the underworlder known as Xanon wants to invade the land topside in hopes to find a cure, then Cave, Bulldozer, and Christie must ally up with a rebel faction to stop him.