This sewage man-monster lurks in the sewers of the city, emerging when needed... to the dismay of evildoers.

In the 1970s, an early offshoot of the Vortex Project tests the V Formula for biological waste treatment. Hector Kazan is a worker sent down to repair a leak, but he is instead caught in a massive spill, suffused with chemicals and sewage, and becomes a gross shambling creature. Hector had been a friendly gregarious guy, but after becoming Sludge, everyone is repulsed by him. This saddens him, but doesn't diminish his heroic impulses.