Sludge was a comic book series published by Malibu comics. The series follows Sludge, a living mass of slime.

Frank Hoag was a corrupt NYPD detective who finally grew a spine when he was asked by his mob bosses to kill a fellow dirty cop. When he refuses, his own murder is ordered; he dies by a hail of bullets as well as a bomb. The explosion covers him with chemicals, which combine with the sewage from where the mobsters dump his body. The chemicals had regenerative properties and tried to heal Hoag, but combined the sewer substances with his body, transforming him into a huge mass of living slime. He awakens with a raging anger against criminals and an inabillity to think and speak coherently. Many words come out replaced with one that sounds similar, such as 'munch' instead of 'mutual'.

Sludge #1	Sludge #2	Sludge #3	Sludge #4
Sludge #5	Sludge #6	Sludge #7	Sludge #8
Sludge #9	Sludge #10	Sludge #11	Sludge #12
Sludge - Red X-Mas #1