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The Sinister Felines From Atop the Litterbox (SFFATL for short) are the pet cats of the [[Delightful Children From Down the Lane]] and the enemies of the Hamsters Next Door. Both are animal counterparts to their owners.
They have only appear in Operation: H.A.M.S.T.E.R., in which they crash the party the Hamsters are holding and capture them. The Hamsters Next Door then battle the cats throughout the Sector V Treehouse and ultimately defeat them, in a Tom and Jerry-esque fashion.