Babbit and Catstello are the main characters from "A Tale of Two Rats", and are exhange minions to Ratigan in The Great Mouse Detective. However, they were proven to be even more useless then Fidget with their cowerdice and comedical short-sightedness. After they were captured, they reformed and became Basal's assisents, along with Dawson. They haven't exactly been seen again since.
PTE Redux Conditions: As Babbit and Catstello's original counterparts were cats, they will appear in PTE's own adaptation of The Great Mouse Detective, since PTE doesn't hold the same anti-cat-ism rule as SAF.