|The Sludge King|
|First appearance|| The Sludge King: Part 1 (1995) (computer-animated)|
The Sludge King: Part 2 (1995)
The Sludge King is the main antagonist in The Sludge King: Part 2. Felix first saw him in a computer animation where a computer-animated version of him fell down the sewers and was captured by a computer-animated Sludge King.
In Part 2, he captured Rosco and Felix with a desire to eat them. However, Felix literally rewound the cartoon back to the moment where he saw the computer animation, saw what happened next, and reenacted the gag: he convinced the Sludge King to drink enough grog to use a portable outhouse, then escaped with Rosco.
The Sludge King is made of yellow sludge and has black eyes. He wears a blue crown on his head and a brown cape.