S1, E304: The Insectibles discover a crucial Shrinkinator part but are forced to entrust it to the cockroaches. Concerned by Willow's neglect of her duties, Zak, Chowser, and Syd enlist Detective Rick Sting'em to investigate. Meanwhile, as Chowser undergoes a butterfly transformation, the Insectibles grapple with the challenge of keeping their mission on track.