Jack Skeletron and Zero by DrinksNS on DeviantArt

Jack and Zero by TonAlleks on DeviantArt

Jack Skeleton and his dog Zero by IntenseObservation on DeviantArt

Jack Skellington and Zero by brazilianferalcat on DeviantArt

Nightmare Before Christmas Jack and Zero by seralucos on DeviantArt

Jack Skellington and Zero Cubeecraft by PieroGutVas13 on DeviantArt

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Starfire vs Jack Skellington by Dr503837 on DeviantArt

Day 13 - The Nightmare Before Christmas Poster by NiallNorwood66 on DeviantArt

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Jack Skellington & Zero by Dan Brereton , in Alex Winter's Alex Winter Comic Art Gallery Room

All Hearts - Jack Skellington and Zero by LynxGriffin on DeviantArt