He does not require air and is immune to most chemical toxins. His touch melts human flesh. Sludge appears in the Ultraforce animated cartoon. In the series, he is an underling of Lord Pumpkin, who ironically was one of his enemies in the comics, forced into being so due his addiction to a drug that Pumpkin created that restores him to human form. He sacrifices himself to stop a demon plant created by Pumpkin.