Squeakus was the main antagonist in the Catscratch's episode Bringin' Down the Mouse and is probably the most evil villain of the series. A very evil mouse who tricks Waffle into thinking his two older brothers are mice. In the episode, he is described to be the only uncatchable mouse. (also by Mr. Blik as 'ugly')
Despite being only a mouse, many fear cats hunt because of their great intelligence to catch them. His dislike and hatred to cats, perhaps due to the same aversion that cats have to hunt mouses.
Waffle used to be his friend, even he always believed he was telling the truth when he said his brothers Blik and Gordon were mice, it believed it, but when I was lying Waffle, Waffle leaves him dying with his "breath." No one knows more about him in other episodes, but probably died when he showed his breath Waffle, Waffle finally wins the respect of his brothers after being caught in a dangerous mouse, as it previously did not consider hunter.