In Cold Fish, The Caped Cod has a different voice actor. Why this change was made is unknown.
He is similar to Bob the Killer Goldfish, one of the villains from the video game and cartoon series, Earthworm Jim. Both are rulers of a part of the sea, both hate their enemies and plan to destroy them, and they can both go onto the surface only with a fishbowl that allows them to breathe.
Not only does he call Dudley the Dog King, but he also calls Kitty the Beautiful Princess.