Now, lissen here, see! Mighty Mouse has caught the attention of a gangster cat (you can tell by the Edward G. Robinson mimic), who sends the cats of a local slum after not only the mice, but Mighty Mouse as well. Here's "Dead End Cats":
Not much dialogue was needed, but then again, the cats as a rule in this series aren't exactly quick on the uptake. Like, did they really think locking Mighty Mouse in a safe and coating it in cement before dumping it in the river would hold him? Please.