The Filthy Attack Roach is an enemy that appears in EarthBound's Fourside Sewers and outside of Mother 3's Saturn Valley. In EarthBound it is extremely weak to fire, ice, paralysis, and brainshock, whereas in Mother 3 it is weak to PK Freeze. It has an 8 in 128 chance of dropping a Secret Herb in EarthBound, while there is a 10% chance of it dropping a Paper Fan in Mother 3.

In Mother 3, its battle sound is Battle Sound 29, a battle sound used exclusively by spud bugs and roaches, which falls under Code Numbers 523 for regular attack, 524 for Smaaaash! and 525 for Miss.